Question 3 :
Assertion: pH of a neutral solution is always $7$. Reason: pH of a solution does not depend upon temperature.

Question 4 :
$p{ K }_{ a }$ values of four acids are given below at ${ 25 }^{ o }C$. The strongest acid is:

Question 7 :
$1.0 \ L$ 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 11 :
$\text{Statement}:$&#160;Baking soda or baking powder is different.<br/>Answer whether the above statement is true or false.<br/>

Question 12 :
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 13 :
One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is:

Question 15 :
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 17 :
One of the major constituents of baking powder is sodium hydrogen carbonate, the other constituent is:<br>

Question 18 :
Which one of the following processes does not occur during formation of $CH{ Cl }_{ 3 }$ from ${ C_2 H }_{ 5 }OH$ and bleaching powder?

Question 20 :
$CO_2$ 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 21 :
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 23 :
$\dfrac{N}{10}$ 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 24 :
Iso-electric point of alanine is (pH = $6$). At which pH, maximum concentration of zwitter ion of alanine will be present?

Question 25 :
$1.0$ 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 26 :
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 27 :
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 28 :
$NaHCO_{3}$ 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 30 :
Which is the correct for the following reaction:&#160;<br/>$B\, (OH)_3\, +\, H_2O\, \rightarrow \, [B(OH)_4]^-\, +\, H^+$

Question 33 :
$Li$, $K$, $Ca$, $Na$, $Mg$, $Al$, $Zn$, $Fe$, $Pb$, $Cu$, $Hg$, $Ag$<br/>Which metal will displace hydrogen from acids but not water?

Question 35 :
The bonds present in $\left( { N }_{ 2 }{ O }_{ 5 } \right) $ are:<br/>

Question 36 :
Read the following statements and answer as true or false.<br/>Metals occur in nature only as free elements.<br/>

Question 37 :
During the formation of ionic bond ________transfer takes place from one atom to the others.

Question 41 :
Extraction of metals from its ores contain the following stages such as calcination and :<br/>

Question 42 :
The carbon-based reduction method is not used for the extraction of :<br/>

Question 43 :
Ionic compounds do not conduct electricity in solid state. Identify the correct reason.

Question 44 :
Which of the following is the correct word to&#160;indicate the molar mass of an ionic substance?

Question 45 :
$\displaystyle xFe+yH_{2}O\rightarrow zFe_{3}O_{4}+wH_{2}$<br>What are x, y, z and w respectively ?

Question 46 :
Minerals that have a relatively high concentration of metal and can be extracted in an easy and cost-effective process are called:

Question 48 :
Which of the following is added to remove permanent hardness of water?

Question 53 :
Mark the correct statements:<br/><br/>(i) mercury can be refined by the process of distillation.<br/><br/>(ii) In poling, the molten impure metal is stirred with green poles of wood.<br/><br/>(iii) In electrolyte refining of metals, impure metal is made as cathode and a thin strip of pure metal is made as anode.

Question 54 :
For purification of alumina, the modern processes most useful when (i) The impurity present is lot of iron oxides and (ii) the impurity present is a lot of silica, are

Question 55 :
Which of the following equilibria would have the lowest value of $K_{p}$ at a common temperature?

Question 57 :
Which of the following sets of characteristics leads to the increase in solubility of ionic substances?

Question 60 :
Which of the following statement is incorrect about the extraction of lead from galena?<br>

Question 61 :
Which type of chemical decomposition reaction is the following reaction?<br>$Cu(OH)_2\xrightarrow {heat} CuO+H_2O$

Question 62 :
Name the type of the following chemical reaction.$2KClO_3 \rightarrow 2KCl +3O_2$

Question 64 :
Which of the following reaction requires oxygen to be a reactant ?

Question 65 :
$KXO_3$(s) well mixed with water, temperature of solution falls. This reaction is:<br/>

Question 67 :
AB + CD $\rightarrow$ AD + BC<br/><br/>The reaction is an example of _________.<br/><br/><br/>

Question 69 :
What is the difference between displacement over double displacement reactions ?

Question 71 :
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 72 :
Select the correct alternative.Which of the following is a decomposition reaction?

Question 74 :
When magnesium burns in air, compound of magnesium formed are magnesium oxide and :

Question 75 :
A chemistry student is attempting to decompose hydrogen peroxide as follows:<br>$H_{2}O_{2(g)} \rightarrow H_{2(g)} + O_{2(g)}$<br>What can the chemistry student do to increase the rate of decomposition?

Question 76 :
Ferrous sulphate decomposes with the evolution of a gas having&#160;a characteristic odour of burning sulphur. Identify the type of reaction.<br/>

Question 78 :
Name the type of following chemical reaction.$CaCO_3 \rightarrow CaO + CO_2$

Question 79 :
Magnesium ribbon is burnt in an atmosphere of nitrogen gas&#160;to form solid magnesium nitride. This is a :<br/>

Question 80 :
When $Fe$ replaces $CuSO_4$ in the following reaction, what will be the ionic compound that forms between Fe and $CuSO_4$?

Question 81 :
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 82 :
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 83 :
Which of the following chemical reaction is balanced as well as is combustion reaction?

Question 84 :
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?

Question 85 :
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 86 :
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 87 :
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 88 :
The equation which is balanced and represents the correct product is:

Question 90 :
What is not a mole ratio of $ \displaystyle 6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2$? <br/>