Question 3 : The acid present in the body of red ant is ________.<br/>

Question 4 : The chloride salt of a certain weak monoacidic organic base is hydrolysed to an extent of $3$% in its $0.1M$ solution at ${25}^{o}C$. Given that the ionic product of water is ${10}^{-14}$ at this temperature, what is the dissociation constant of the base?

Question 6 : When the soil is too basic, plants do not grow well in it. To improve its quality what must be added to the soil?

Question 8 : $pK_{a}$ of acetic acid is <b>4.741</b>. The concentration of $CH_{3}COONa$ is <b>0.01</b> M. The pH of $CH_{3}COONa$ is?

Question 12 : Calculate the pH of a solution which is 0.1 M in HA and 0.5M in NaA. Ka for HA is $1.8\times { 10 }^{ -6 }$?

Question 13 : Water of crystallization&#160;is the fixed number of water molecules chemically attached to a&#160;unit of a salt in its crystalline form.<br/>

Question 14 : The hydrogen ion concentration of the oceans is about $2\times10^{-9}\space M$. What is the $pH$?

Question 16 : When $NH_{3}(0.1\ M) 50\ ml$ mix with $HCl (0.1\ M)\ 10\ ml$ then what is $pH$ of resultant solution $(Pk_{b} = 4.75)$.

Question 17 : Effervescence is seen when a bottle of soda water is opened.

Question 18 : Aquaregia is prepared by mixing conc. $HCl$ and $conc. HNO_3$ in the ratio ________&#160;

Question 25 : $1.0 \ L$ solution is prepared by mixing $61 \ gm$ benzonic acid $(pK_a = 4.2)$ with $72 \ gm$ of sodium benzoate and then $\text{300 mL 1.0 M HBr}$ solution was added. the $pH$ of final solution is:-

Question 26 : Which of the following methods is adopted for preparing dilute solution of ${ H }_{ 2 }S{ O }_{ 4 }$?

Question 27 : In which of the following reactions does conc.${ H }_{ 2 }S{ O }_{ 4 }$ act as an oxidising agent?

Question 28 : If tartaric acid is not added in baking powder, the cake will taste bitter due to te presence of -

Question 30 : If $H^{+}$ion concentration of a solution is increasedby $10$ times, its $pH$ will :<br>

Question 31 : Which part of tooth, made up of calcium phosphate, is the hardest substance in the body?

Question 32 : Four solutions A, B, C and D&#160;when tested with universal indicator showed pH as $4, 11, 7$ and $9$ respectively. Which one of the four solutions is neutral?<br/>

Question 33 : The solution of bleaching powder in water is always a clear solution.<br/>

Question 34 : Which colour appears when few drops of phenolphthalein put into test tube contains lime water?

Question 36 : Assertion: pH of a neutral solution is always $7$. Reason: pH of a solution does not depend upon temperature.

Question 37 : $p{ K }_{ a }$ values of four acids are given below at ${ 25 }^{ o }C$. The strongest acid is:

Question 41 : Statement I: A basic solution has more hydrogen ions than an acidic solution.<br/>Statement II: pH is defined as the -log $[H^+]$.<br/>

Question 43 : When sample of baking soda is strongly ignited in crucible it suffered loss in weight of&#160; $3.1 g $&#160; the mass of baking soda is-&#160;

Question 47 : Assertion: At ${ 25 }^{ o }C$, the pH of ${ 10 }^{ -8 }M$ $HCl$ is $8$. Reason: pH of acidic solution is always below $7$ at ${ 25 }^{ o }C$.

Question 49 : The $pH$ of a $0.02\ M$ ammonia solution which is $5\%$ ionized will be:

Question 50 : Select correct statement for <b>50ml 0.1M</b> ${ H }_{ 2 }A(aq.)$ solution ;&#160;${ { K }_{ a } }_{ 1 }={ 10 }^{ -5 } ; { { K }_{ a } }_{ 2 }={ 10 }^{ -8 }$<br/>

Question 54 : At $25^0$C, the solubility product of $Mg(OH)_2$ is 1.0 x $10^{-11}$. At which pH, will $Mg^{2+}$ ions start precipiating in the form of $Mg(OH)_2$ from a solution of 0.001 M $Mg^{2+}$ ions?

Question 55 : The discomfort caused by indigestion due to over-eating can be cured by taking:

Question 56 : $CO_2$ gas along with solid $(Y)$ is obtained&#160;when sodium salt $(X)$ is heated. $(X)$ is again obtained when $CO_2$ gas is&#160;passed into aqueous solution of $(Y)$. $(X)$ and $(Y)$ respectively are :

Question 57 : Copper sulphate pentahydrate is commonly called as_______, whereas ferrous sulphate heptahydrate is commonly called as ________ .

Question 60 : What will be the value of $pH$ of $0.01\ mol \, dm^{-3}$ $CH_3COOH$?&#160;$(K_a$=$1.74\times10^{-5})$

Question 61 : On adding which of the following, the pH of $20$ ml of $0.1 N$ $HCl$ will not alter?

Question 62 : Salt $A$ commonly used in bakery products, on heating, gets&#160;converted into another salt $B$ which itself is used for removal of&#160;hardness of water and a gas $C$ is evolved. The gas $C$ when passed&#160;through lime water turns it milky. Identify $A,\ B$ and $C$.<br/>

Question 63 : The crystalline salt, $Na_{2}SO_{4}xH_{2}O$ on heating losses $55.9\%$ of its weight. The formula of the crystalline salt is :

Question 64 : Upon mixing equal volume of two solution of strong acids having pH values $2$ &amp; $4$,resulting solution will have pH:

Question 66 : $100ml$ of $0.1N$ $NaOH$ is mixed with $100ml$ of $0.1 NH_2SO_4$. The $pH$ of the resultant solution is :

Question 68 : 0.24 g sample of $Mg$ react with 80.0 mL of $HCl$ solution whose $pH$ is 0.30. $pH$ after all $Mg$ has reacted is:

Question 71 : ${K}_{w}$ for ${H}_{2}O$ is $9.62\times {10}^{-14}$ at ${60}^{o}C$. What is $pH$ of water at ${60}^{o}C$.

Question 73 : Which of the following items are not bleached by bleaching powder?

Question 74 : Which of the following salts does not contain water of crystallisation ?

Question 75 : Sodium hydrogen carbonate when added to acetic acid evolves a gas. Which of the following statement are true about the gas?<br>(i)It turns lime water milky<br>(ii)It extinguishes a burning splinter<br>(iii)It dissolves in a solution of sodium hydroxide<br>(iv)It has a pungent odour

Question 79 : Available chlorine can be liberated from bleaching powder by the reaction with:<br/>

Question 80 : A substances A reacts with another substances B to produce the product C and a gas D. If a mixture of the gas D and ammonia is passed through an aqueous solution of C, baking soda is formed. The substances A and B are:

Question 81 : State whether the given statement is true or false:<br/>Bleaching powder contains about 50 % available chlorine.<br/>

Question 82 : The compounds which is used in glass , soap and paper industries is :

Question 85 : Which of the following has the highest value of pH at the same temperature for the same concentration?

Question 86 : Equal volumes of two solutions with&#160;$p{H}=3$ and&#160;$p{H}=11$ are mixed. Then the&#160;$p{H}$ of the resulting solution is:

Question 87 : The pH of a $0.02M$ ammonia solution which is $5 \%$ ionised will be:

Question 91 : What is the minimum $pH$ when $Fe(OH)_3$ starts precipitating from a solution contain $0.1M\ FeCl_3$? $K_{sp}$ $Fe(OH)_3 = 8\times 10^{-13}M^3$

Question 93 : Percentage ionisation of water at certain temperature is $3.6\times { 10 }^{ -7 }$%. Calculate ${K}_{w}$ and $pH$ of water.

Question 94 : The aqueous solution of which one of the following is basic?

Question 95 : The indicator constant for an acidic indicator , HIn is $ 5 \times 10^{-6}&#160; M $. this indicator appears only in the colour of acidic from when $ \frac { [In^- ] }{ [HIn]} \le \frac {1}{20} $ and it appears only in the colour of basic form when $ \frac { [HIn]}{[In^-]} \le \frac {1}{40} . $ the pH range of indicator is:

Question 96 : Baking powder used to make a cake is a mixture of starch, $NaHCO_3$ and $Ca(H_2PO_4)_2$. The function of $Ca(H_2PO_4)_2$ is:<br/>

Question 97 : The $pH$ of $HCl$ is 1. $1.10\ ml$ of this solution is reacted with $40\ ml$ of $NaOH$ solution whose $pH=12$. The $pH$ of resulting solution is:&#160;$(\log(1.2)=0.108)$<br/>

Question 98 : To $1.0 L$ solution containing $0.1$ mol each of $NH_3$ and $NH_4Cl, 0.05$ mol NaOH is added. The change in pH will be : $(pK_a$ for $CH_3 COOH=4.74$)

Question 99 : $1.0$ ml of a solution of $HCl$ with a $pH$ of $4.0$ is added it to $9.0$ ml of distilled water, the $pH$ of the final solution will be:

Question 100 : One mole of ammonia was completely absorbed in one litre solution each of<br/>I. $1\ M\ HCl$<br/>II. $1 \ M\ CH_3COOH$&#160;<br/>III. $1\ M\ H_2SO_4$ at $298$ K<br/>The decreasing order for the $pH$ of the resulting solution is:(Given: $K_b (NH_3) = 4.74$)

Question 102 : The $pH$ at which a 0.01 M ${ Al }^{ +3 }$ solution is 99.99% precipitated is: $\left( { K }_{ sp } \ \ Al\left( OH \right) _{ 3 }=1\times { 10 }^{ -18 }at\quad 25 \right)&#160;$

Question 103 : When ethyl alcohol is heated with a paste of bleaching powder, we get a compound in which the function of bleaching powder is:&#160;

Question 104 : Substance $X$:<br/>(I) reacts with $H_2S$ to produce white turbidity.<br/>(II) changes light green solution of $FeSO_4$ into yellow colour.<br/>(III) reacts with moisture to give pungent smelling gas.<br/>Hence $X$ is:

Question 105 : What is the correct increasing order of the $pH$ values&#160;of the following solutions with equal concentrations?

Question 107 : When chlorine is passed over dry slaked lime at room temperature, the main reaction product is:

Question 108 : Which is the correct for the following reaction:&#160;<br/>$B\, (OH)_3\, +\, H_2O\, \rightarrow \, [B(OH)_4]^-\, +\, H^+$

Question 109 : The first and second dissociation constants of an acid $H_{2}A$ are $1.0\times 10^{-5}$ and $5.0\times 10^{-10}$ respectively. The overall dissociation constant of the acid will be:

Question 110 : $1\ cc$ of $0.1N$ $HCl$ is added to $1$ litre solution of sodium chloride. The $pH$ of the resulting solution will be:

Question 113 : $\dfrac{N}{10}$ acetic acid was titrated with $\dfrac{N}{10}$ $NaOH$. when 25%, 50% and 75% of titration is over then the $pH$ of the solution will be (respectively):&#160;$[K_a = 10^5]$&#160;

Question 114 : The $pH$of $0.1 M$ solution of the following salts increases in the order

Question 115 : The $pH$ of a buffer solution containing equal molar concentration of a week base and its chloride ($K_{b}$ for weak base $=2\times 10^{-5}$) is :

Question 116 : Iso-electric point of alanine is (pH = $6$). At which pH, maximum concentration of zwitter ion of alanine will be present?

Question 117 : The third dissociation constant of $H_{3}PO_{4}$ is $1.3\ \times 10^{-12}$. Assume that the hydrolysis proceeds only in the first step, the $pH$ of $0.1\ M\ K_{3}PO_{4}$ solution is:

Question 118 : Number of $OH^-$ in 1 mL solution of pH = 13 is:

Question 119 : $NaHCO_{3}$ can be used on its own to make cakes or bread. Baking powder is more commonly used, and contains $NaHCO_{3}$, $Ca(H_{2}PO_{4})_{2}$ and starch. An improved combination baking powder contains about 40% starch, 30% $NaHCO_{3}$&#160;20% $NaAl(SO_{4})_{2}$ and 10% $Ca(H_{2}PO_{4})_{2}.$&#160;Answer the following questions based on above study.<br/>Rise in bread and cakes is due to______ when it decomposes between $50^{o}C$ and $100^{o}C$.&#160;

Question 121 : The $pH$ of $0.1M$ solution of the following salts increases in the order:

Question 123 : Which one of the following solutions will have the highest pH value?

Question 125 : Dissociation constants of $CH_3COOH$ and $NH_4OH$ in aqueous solution are $10^{-5}$. If pH of a $CH_3COOH$ solution is $3$. What will be the pH of $NH_4OH$?

Question 127 : The $pH$ of a ${ 10 }^{ -9 }\ M$ solution of $HCl$ in water is :<br>

Question 129 : $NaHCO_{3}$ can be used on its own to make cakes or bread. Baking powder is more commonly used, and contains $NaHCO_{3}$, $Ca(H_{2}PO_{4})_{2}$ and starch. An improved combination baking powder contains about 40% starch, 30% $NaHCO_{3}$&#160;20% $NaAl(SO_{4})_{2}$ and 10% $Ca(H_{2}PO_{4})_{2}.$&#160;Answer the following questions based on above study.<br/>$Ca(H_{2}PO_{4})_{2}$ in baking powder:

Question 130 : $NaHCO_{3}$ can be used on its own to make cakes or bread. Baking powder is more commonly used, and contains $NaHCO_{3}$, $Ca(H_{2}PO_{4})_{2}$ and starch. An improved combination baking powder contains about 40% starch, 30% $NaHCO_{3}$&#160;20% $NaAl(SO_{4})_{2}$ and 10% $Ca(H_{2}PO_{4})_{2}$Answer the following questions based on above study.<br/><br/>In improved baking powder, $NaAl(SO_{4})_{2}$ is used for :

Question 131 : The more commonly used baking powder contains about 30% $NaHCO_3$, 20% $NaAl(SO_4)_2$, 10% $Ca(H_2PO_4)_2$ and 40% starch. Which of the following statements are correct?<br/>

Question 132 : The ions responsible for the bleaching action of bleaching powder and the ions responsible for loss of bleaching action of bleaching powder due to the storage for long time respectively are:<br/>

Question 134 : What is the difference between displacement over double displacement reactions ?

Question 135 : The substance that initially involved in a chemical reaction is called a reactant.

Question 136 : Which of the following reaction requires oxygen to be a reactant ?

Question 137 : An oxidizing agent is always takes part in the reduction process while a reducing agent is always take part in the _______ process.

Question 138 : When chlorine reacts with sodium bromide the solution turns brown because ________.

Question 139 : Which type of chemical decomposition reaction is the following reaction?<br>$Cu(OH)_2\xrightarrow {heat} CuO+H_2O$

Question 141 : Balanced chemical equations imply which of the following?<br>$I$. Numbers of molecules are conserved in chemical change<br>$II$. Numbers of atoms are conserved in chemical change.<br>$III$. Mass is conserved in chemical change.

Question 143 : A chemical reaction in which heat is evolved is called a/an:<br/>

Question 145 : Identify the type of reaction which will occur based on the information provided about the reactants:<br>${CH}_{4}(g)+{O}_{2}(g)\rightarrow$

Question 146 : $KXO_3$(s) well mixed with water, temperature of solution falls. This reaction is:<br/>

Question 148 : Reaction of iron nails with copper sulphate solution is an example of ____________.

Question 149 : Which of the following is an example of the exothermic reaction ?

Question 150 : In the reaction, $4Fe+3O_2\rightleftharpoons 4Fe^{3+}+6O^{2-}$ Which of the following statements is incorrect?

Question 151 : A less reactive metal replaces a more reactive metal from its salt solution in water.<br>

Question 155 : Aqueous solutions of magnesium chloride and silver nitrate are mixed to form solid silver chloride and aqueous magnesium nitrate.<br/><br/>The balanced molecular equation contains which one of the following terms?

Question 156 : Three cations $A, B, C$ are allowed to react with ammonium hydroxide solution. $A$ and $B$ produce a dirty green precipitate and a reddish brown precipitate respectively, both of which do not dissolve on further addition of ${NH}_{4}OH$. $C$ gives pale blue colour precipitate with less amount of ammonium hydroxide and on further addition of ${NH}_{4}OH$, precipitate becomes soluble and deep blue colour solution is formed:

Question 160 : Name the type of the following chemical reaction.$2KClO_3 \rightarrow 2KCl +3O_2$

Question 161 : The conversion of ${Cr}_{2}{O}_{7}^{2-}$ to ${Cr}^{3+}$ during a chemical reaction is an example of:

Question 164 : Which of the following symbol is used to show solid precipitate?

Question 165 : Other signs of a chemical reaction might be an increase in temperature if heat is released or a change in _____.

Question 166 : AB + CD $\rightarrow$ AD + BC<br/><br/>The reaction is an example of _________.<br/><br/><br/>

Question 167 : The reaction of hydrochloric acid with zinc oxide to form zinc chloride and water is neutralization reaction. State whether the statement is true or false

Question 170 : State true or false.<br/>In a chemical equation, the products are written on the left-hand side and the reactants on the right-hand side with an arrow in between.

Question 173 : <p>Oils on treating with hydrogen in the presence of palladium or nickel&#160;catalyst&#160;form fats.&#160;This is an example of :</p>

Question 174 : State true or false.<br/><br/>In redox reactions, oxidation and reduction take place simultaneously.<br/>

Question 177 : In $HS^, I^, R-NH_2, NH_3$ order of proton&#160;excepting tendency will be:

Question 179 : $FeCl_3 + 3NaOH \rightarrow 3NaCl + Fe(OH)_3$<br/><br/>The reaction is an example of________.

Question 180 : Exposure of silver bromide to sunlight for a long duration turns grey due to:

Question 181 : In the context of redox reactions, the gain of hydrogen from a substance is known as:

Question 182 : How many molecules of $CO_2$ are formed when one molecule of $C_6H_{12}O_6$ is oxidised in our body?

Question 183 : <p>Reaction of iron filings with powdered sulfur is a _____ process.<br/></p>

Question 184 : When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. The reaction is an example of:<br/>

Question 185 : The activity of the metal barium is between that of&#160;sodium and potassium. It is likely that:

Question 186 : Reaction of iron nails with copper sulphate solution is an example of:<br>

Question 188 : When sodium sulphate solution reacts with barium chloride solution, the solution after the reaction contains mainly.....

Question 189 : In a change hydrogen peroxide gives rise' to hydrogen oxide and oxygen. This is an example of:

Question 193 : Formation of nitric oxide from nitrogen and oxygen is a ______ reaction.

Question 195 : Identify the product(s) which will be formed by using the information provided about the reactants :<br/>${C}_{4}{H}_{10}(g)+{O}_{2}(g) \rightarrow$

Question 197 : Which of the statements about the reaction below are incorrect?<br/>$2PbO\left( s \right) +C\left( s \right) \rightarrow 2Pb\left( s \right) +C{ O }_{ 2 }\left( g \right) $<br/>(a) Lead is getting reduced.<br/>(b) Carbon dioxide is getting oxidised.<br/>(c) Carbon is getting oxidised.<br/>(d) Lead oxide is getting reduced.

Question 198 : On heating blue coloured powder of copper(II) nitrate in a boiling&#160;tube copper oxide (black), oxygen gas and a brown gas X is formed.&#160;Which type of reaction is this?<br/>

Question 200 : The reaction between carbon and oxygen can be represented as $C_{(s)}+O_{2(g)}\rightarrow CO_{2(g)}+heat$.<br/><br/>In which of the following type(s), the above reaction can be classified?<br/>I. Combustion reaction<br/>II. Displacement reaction<br/>III. Endothermic reaction<br/>IV. Combination reaction.<br/>

Question 201 : Ferrous sulphate decomposes with the evolution of a gas having&#160;a characteristic odour of burning sulphur. Identify the type of reaction.<br/>

Question 202 : Two aqueous solutions are mixed and a precipitate is formed. What type of reaction is it?&#160;

Question 203 : Given $4NH_3(g)+5O_2(g)\rightarrow 4NO(g)+6H_2O(g)$<br>The above reaction is an example of:<br>(i)displacement reaction<br>(ii) combination reaction<br>(iii) redox reaction<br>(iv)neutralisation reaction

Question 204 : The decomposition of mercuric oxide ($Hg)$) on heating, resulting in the formation of mercury and oxygen, is represented by the following chemical equation-<br/>$2HgO+180kJ\longrightarrow 2Hg+{O}_{2}$<br/>Which one of the following represents the heat of formation of mercuric oxide?

Question 205 : The decomposition of $KClO_3$ to $KCI$ and $O_2$ on heating is an example of:

Question 207 : When lead nitrate is heated, it breaks down into lead monoxide, nitrogen dioxide and oxygen as given below:$2Pb(NO_3)_2\rightarrow 2PbO+4NO_2+O_2$<br/>The above reaction is an example of :

Question 210 : Assertion: In a reaction<br/><br/>$Z n ( s ) + CuSO_4 (aq) \rightarrow ZnSO_4 (aq) + Cu(s)$<br/><br/>Zn is a reductant but itself get oxidized. Reason: In a redox reaction, oxidant is reduced by accepting electrons and reductant is oxidized by losing electrons.

Question 212 : Write the type of reaction.<br/>Ethene is burnt in the presence of oxygen to form carbon dioxide, water and releases heat and light.<br/>

Question 213 : Assertion: When a copper wire is dipped in silver nitrate solution, there is no change in the colour of the solution Reason: Copper cannot displace silver from its salt solution

Question 214 : Four hypothetical metallic elements $A, B, C$ and $D$ forms soluble nitrates having formulae $ANO_3, B(NO_3)_2, CNO_3$ and $D(NO_3)_3$.<br/>Strips of each of the four metals were immersed in $0.1\ M$ aqueous solution of the other metal nitrates, and the following observations recorded.<br/>1. Metal $B$ underwent reaction in all solutions.<br/>2. Metal $A$ only reacted with $CNO_3$.<br/>In order of increasing strength as reducing agents, the metals are :

Question 215 : In an oxidation process for a cell,<br>$M_1 \rightarrow{ M }_{ 1 }^{ n+ } + ne^- $<br>the other metal $(M_2)$ being univalent showing reduction takes up _____ electrons to complete redox reaction.

Question 216 : Breaking of lead bromide into lead and bromine is an example of _____.

Question 218 : What type of chemical reaction does the reaction belong to?<br/>Hydrogen sulphide gas reacts with oxygen gas to form solid sulphur and liquid water.<br/>

Question 219 : Which substance is serving as a reducing agent in the following reaction?<br/><br/>&#160; &#160; $FeSO_4+Mg\rightarrow MgSO_4+Fe$

Question 220 : The law of conservation of mass is valid for which of the following?<br/>(a)&#160;Reactions involving oxidation.<br/>(b)&#160;Nuclear reactions.<br/>(c) Endothermic reactions.

Question 222 : <p>Ferric oxide reacts with aluminium to produce aluminium oxide&#160;and iron. The balanced chemical equation for the given reaction is :</p><p>$Fe_2O_3$ + $2Al$ $\rightarrow $&#160;$Al_2O_3$ + $2Fe$&#160;</p><p>Which of the following substances is oxidized in the given&#160;reaction?</p>

Question 223 : The chemical equation $Ba{ Cl }_{ 2 }+{ Na }_{ 2 }S{ O }_{ 4 }\rightarrow BaS{ O }_{ 4 }+2NaCl$ represents following type of chemical reaction.

Question 225 : When calcium nitrate thermally decomposes oxygen is one of the products. Which volume of oxygen is produced under room conditions when $0.50$ mol of calcium nitrate thermally decomposes?

Question 227 : Magnesium reacts with acids producing hydrogen and corresponding magnesium salts. In such reactions Mg undergoes.

Question 229 : What happens when a piece of&#160;zinc metal is added to copper sulphate solution ?<br/>

Question 230 : How much $CaO$ is to be added to the furnace charge for each $1280\ kg$ of pure $CaC_{2}$ produced ?

Question 231 : The equation which is balanced and represents the correct product is:

Question 232 : A metal ($A$) on heating in nitrogen gas gives compound $B$. $B$ on treatment with ${H}_{2}O$ gives a colourless gas which when passed through $Cu{SO}_{4}$ solution gives a dark blue-violet coloured solution. $A$ and $B$ respectively, are :

Question 233 : How many grams of ammonium nitrate will be formed in the reaction?

Question 234 : What mass of ammonium nitrate should be heated to produce 8.96 litres of steam?&#160;[Note : Relative molecular mass of $NH_4NO_3$ is 80]

Question 235 : What amount of $BaSO_4$ can be obtained on mixing 0.5 mole $BaCl_2$ with 1 mole of $H_2SO_4$ ?

Question 237 : A quantity of $6\ g\ NaOH$ and $4.4\ g\ CO_{2}$ is allowed to react to form $Na_{2}CO_{3}$ or $NaHCO_{3}$ or both. Which of the following is correct statement regarding the reaction?

Question 238 : What is not a mole ratio of $ \displaystyle 6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2$? <br/>

Question 239 : Which of the following chemical reaction is balanced as well as is combustion reaction?

Question 241 : Consider the following statements.<br/><br/>1.&#160;If all the reactants are not taken in their stoichiometric ratio, then at least one reactant will be left behind.<br/><br/>2.&#160;2 moles of $H_2(g)$ and 3 moles of $O_2 (g)$ produce 2 moles of water.<br/><br/>3. If equal weights of carbon and oxygen are taken to produce $CO_2$, then $O_2$ is limiting reagent.<br/><br/>The above statements 1, 2, 3 respectively are (T = True, F = False):

Question 242 : For the cell $Zn(s) |Zn^{2+} (aq) || M^{x+} (aq) | M(s)$, different half cells and their standard electrode potentials are given below:<br/><table class="wysiwyg-table"><tbody><tr><td>$M^{x+} (aq/M(s))$</td><td>$Au^{3+} (aq)/Au(s)$</td><td>$Ag^+ \, /Ag(s)$</td><td>$Fe^{3+}(aq)/Fe^{2+} (aq)$</td><td>$Fe^{2+}(aq)/Fe(s)$</td></tr><tr><td>$E^o_{M^{x+}/M^{/(V)}}$<br/></td><td>$1.40$</td><td>$0.80$</td><td>$0.77$</td><td>$-0.44$</td></tr></tbody></table><br/>If $E^o_{Zn^{2+}/Zn} = -0.76 V$, which cathode will give a maximum value of $E^o_{cell}$ per electron transferred ?

Question 243 : A quantity of 5.68 g of pure $ P_{4}O_{10} $ is dissolved completely in sufficient water and the solution is diluted to 250 ml. Which of the following statement (s) is/are correct?

Question 244 : A mixture of propane and benzene is burst completely in excess of oxygen at $110^{o}C$. It result the production of equal volumes of $CO_{2}(g)$ and steam (measured under identical pressure and temperature). Which of the following is correct regarding the original mixture?

Question 249 : Minimum amount of $Ag_2CO_3$ (s) required to produce sufficient amount of oxygen for the complete &#160;combustion of $C_2H_2$ which produces 11.2 L of $CO_2$ at STP after combustion is_________.<br/>$Ag_2CO_3 (s) \, \rightarrow\, 2Ag (s)\, +\, CO_2 (g)\, +\, \dfrac12 O_2 (g)$<br/>$C_2H_2\, +\, \dfrac52 O_2\, \rightarrow\, 2CO_2\, +\, H_2O$<br/>

Question 251 : An amount of 0.01 mole of $ SO_{2}Cl_{2} $ is hydrolysed completely in sufficientwater (no gas is allowed to escape out ) and the solution is diluted to 200 ml. Which of the following statement is/are correct? (Ag = 108 )

Question 252 : What is the minimum mass of ${ CaCO }_{ 3 }(s)$, below which it decomposes completely, required to established equilibrium in a $6.50\ litre$&#160;container for the reaction:<br/>${ CaCO }_{ 3 }(s)\rightleftharpoons CaO(s)+{ CO }_{ 2 }(g);\space { K }_{ c }=0.005\ mole/litre$<br/>

Question 254 : For the reaction of sodium with water, the balanced equation using the smallest whole numbers has which of the following coefficients?<br/>I. $1$<br/>II. $2$<br/>III. $3$<br/>Select the correct option.<br/>

Question 255 : A quantity of $12\ g$ of magnesium is burnt completely in air $(O_{2}=20\%$ and $N_{2}=80\%$ by volume). Which of the following is/are correct statement(s) regarding this combustion?

Question 257 : The reaction, when balanced, $m, n, p$ and $q$ are respectively:<br/>$K_2Cr_2O_7+ \ m FeSO_4+n H_2SO_4\rightarrow Cr_2(SO_4)_3+pFe_2(SO_4)_3+K_2SO_4+qH_2O$&#160;

Question 258 : If the value of $n$ is $2$, then the atomic weight of metal $M$, is

Question 259 : We know that balancing of a chemical equation is entirely based on the law of conservation of mass. However the concept of Principle of Atom Conservation (POAC) can also be related to law of conservation of a mass in a chemical reaction. So, POAC can also acts as a technique for balancing a chemical equation. For example, for a reaction&#160;$ABC_3 \rightarrow AB +C_2$&#160;On applying POAC for A, B and C and relating the 3 equation we get : $\dfrac {n_{ABC_3}}{2}=\dfrac {n_{AB}}{2}=\dfrac {n_{C_2}}{3}$ (N= number of moles of X)&#160;Thus the coefficients of $ABC_3$, AB and $C_2$ in the balanced chemical equation will be 2,2 &amp; 3 respectively and the balanced chemical equation can be represented as :$2ABC_3 \rightarrow 2AB +3C_2$Now answer the following question.<br/>&#160;<br/>If the weight ratio of C and $O_2$ present is 1:2 and both of the reactants completely cousumes and form CO and $CO_2$ and we will obtain a gaseous mixture of&#160;CO and $CO_2$&#160;. What would be the weight ratio of CO and $CO_2$&#160; in mixture?