Question 1 :
The fifth state of matter i.e. Bose-Einstein condensate was proved in:
Question 3 : <div>Write 'true' or 'false' against the following statement.        <br/></div><div>In a physical change no net energy change is involved.<br/></div><div></div><br/>
Question 4 : <div>Write 'true' or 'false' against the following statement.    </div><div>Rusting of iron is a chemical change.<br/></div><br/>
Question 5 : <div>Write 'true' or 'false' against the following statement.    </div><div>Earthquake is a desirable change.<br/></div>
Question 6 :
_________ is used to measure the pressure of liquids and gases.
Question 9 : <div>Write 'true' or 'false' against the following statement.         <br/></div><div>In a chemical change, rearrangement of molecules and atoms involves some energy changes.<br/></div><div></div><br/>
Question 10 :
As a submarine descends into the deep ocean, the pressure it must withstand increase. At an altitude of $- 700$ meters, the pressure is $50$ atm (atmosphere), and at altitude of $- 900$ meters, the pressure is $70$ atm. For every $10$ meters the submarine descends, the pressure it faces increase by $n$, where $n$ is a constant. What is the value of $n$?
Question 11 : <div>Choose the most appropriate answer:     </div><div>Rising and setting of the sun at a given place is a <br/></div>
Question 12 : <div>Write 'true' or 'false' against the following statement.        <br/></div><div>New substances are formed in a chemical change.<br/></div><div></div><br/>
Question 13 :
Which of the following gases is LEAST dense when all are measured under the same conditions?
Question 14 :
Pressure remaining constant, the volume of a fixed mass of a gas is directly proportional to its absolute temperature. This law is popularly known as :
Question 15 : <div>Write 'true' or 'false' against the following statement.       <br/></div><div>Cutting of paper into pieces is a chemical change.</div><div></div>
Question 17 : <div>Write 'true' or 'false' against the following statement.       <br/></div><div>During a physical change energy is neither given out or absorbed by the system.<br/></div><div></div><br/>
Question 22 :
Solids which are formed by slow cooling will tend to be ________, while solids which are frozen rapidly are more likely to be _________ .
Question 24 :
The weakest interparticle forces are found in which of the following?
Question 26 :
A liquid is in equilibrium with its vapour at its boiling point. On the average, the molecules in the two phases have equal:
Question 32 :
Pressure of a gas mixture of air is measured by ____________.
Question 33 :
Boiling point of hydrogen fluoride is highest amongst $HF,\ HCl,\ HBr$ and $HI$. Which type of intermolecular forces are present in hydrogen fluoride?
Question 34 :
A gas occupies a volume of $250$ ml at $745$ mm Hg and $25^{\circ}$C. What additional pressure is required to reduce the gas volume to $200$ ml at the same time?
Question 35 :
Write whether the following statement is true or false.<br>Solids have the larger Inter-molecular space.<br><br>
Question 37 :
What volume of decinormal ${ K }_{ 2 }{ Cr }_{ 2 }{ O }_{ 7 }$ solution would be needed to convert 1.19 g of tin to stannic chloride in an acidic medium? (${ A }_{ Sn }\ =\<br/><br/>119$)
Question 39 :
Assertion: For a fixed amount of a gas, the product PV is always constant.
Reason: Gases deviate more from ideal behaviour at high pressure and low temperature.
Question 41 :
One litre of gas of mass, $2 g$ at $300 K$ and $1$ atm pressure, the pressure is made $0.75$ atm, at which of the following temperatures will one litre of the same gas have mass of one gram.<br><br>
Question 42 :
At what centigrade temperature will a given volume of a gas at $0^{\circ}$C becomes double if pressure remains constant?
Question 43 :
Lithium reacts with water to produce hydrogen gas and lithium hydroxide. What (approx.) volume of hydrogen collected over water at 22$^oC$ and 750 mm $Hg$ pressure by the reaction of 0.208 g of $Li$?<br/>$\left[ { VP }_{ { H }_{ 2 }O }\ =\ 19.8\ mm\ Hg \right]$
Question 44 :
A solution of 500 mL of 0.2 M KOH and 500 mL of 0.2 M HCl is mixed and stirred ; the rise in temperature is ${ T }_{ 1 }$. The experiment is repeated using 250 mL each of solution, the temperature rise is ${ T }_{ 2 }$. Which of the following is true ?
Question 45 :
The halogen elements create diatomic, non-polar particles. Of the halogens, only iodine is a solid.What type of intermolecular forces are seen for this species?
Question 46 :
What happens to a substance when the space between its particles is decreased?
Question 48 :
A student obtained the values of cohesive energy for four types of crystals as $764, 447, 108$ and $7.74 kJ/mol$ respectively. If the crystals used by him are Ar, Na, Si and $NaCl$, then the correct correlation is :<br/>
Question 50 :
What is the volume at STP of 10 L of gas initially at 546 K and 2 atm ?
Question 51 : <div>At constant pressure, a sample of helium gas has a volume of $800ml$ at ${27}^{o}C$. Calculate the temperature at which the volume will become $20$% of its initial volume.</div>
Question 52 : A balloon is filled with hydrogen at room temperature. It will burst if pressure exceeds $0.2$ bar. <div>If at $1$ bar pressure the gas occupies $22.7$ L volume up to what volume can the balloon be expanded?</div>
Question 53 :
What is the correct sequence of temperature in Kelvin scale which will be obtained by converting $25^o C, \;38^oC,\;66^o C$ to Kelvin scale?<br/>
Question 54 :
Water and chlorobenzene are immiscible liquids. Their mixture boils at ${ 89 }^{ o }C$ under a reduced pressure of $7.7\times { 10 }^{ 4 }Pa$. The vapour pressure of pure water at ${ 89 }^{ o }C$ is $7\times { 10 }^{ 4 }Pa$. Weight percent of chlorobenzene in the distillate is:
Question 55 :
With the decrease in thermal energy of gas molecules, attraction and repulsion forces :
Question 56 : Assertion: A vacuum is a space from which almost all gas has been removed.
Reason: A vacuum is produced by pumping out all the air and other gases.<br/><div>Choose the correct option.</div>
Question 57 :
Which intermolecular force is most responsible in allowing xenon gas to liquefy?
Question 58 :
Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identity the correct set of conditions.<br>
Question 60 :
Write true or false for the statement. Rewrite the false statements correctly.<br/>The intermolecular space in gas is almost negligible.
Question 61 :
The boiling point of water, ethyl alcohol and diethyl ether are ${100}^{o}C, {78.5}^{o}C$ and ${34.6}^{o}C$ respectively. The intermolecular forces will be in the order of :
Question 63 :
Assertion: On increasing the temperature, the fraction of molecules possessing most probable speed increases.
Reason: On increasing the temperature, the most probable speed of a gas increases.
Question 64 :
Write whether the following statement is true or false<br>Intermolecular force of attraction is greater in gases than in liquids .
Question 66 : Assertion: Gases do not have free surfaces.
Reason: Molecules of a gas move randomly in all directions.<br/><div>Choose the correct option.</div>
Question 67 :
Densities of two gases are in the ratio $1 : 2$ and their temperature are in the ratio $2 : 1$, then the ratio of their respective pressure is :
Question 68 :
Arrange the following in increasing order of their intermolecular forces: <br>Nylon-6,6(I), Buna-S(II), Polythene(III)<br>
Question 69 :
Which of the following condition favours the existence of a substance in the solid state?
Question 71 :
Intermolecular force of attraction is greater in gases than in liquids. 
Question 72 :
If the molecular mass of $NH_3$ is $17$, determine the density of ammonia  at STP.
Question 73 :
A person living in Shimla observed that cooking food without using pressure cooker takes more time. The reason for this observation is that at high altitude:
Question 75 :
Assertion: The volume of $1$ mole of an ideal gas at $1$ bar pressure at $25^{0}C$ is $24.78$ L<br/>Reason: $1$ bar $=0.987$ atm<br/>
Question 76 :
Statement 1 : Ammonia gas, $NH_3$ has a smaller density than argon gas, $Ar$, at $STP$.<br/>Statement 2:  The density of a gas at $STP$ is found by dividing the molar mass by $22.4$ litres.
Question 78 :
Assertion : $^{50}Ti$ and $^{50}Cr$ are isotopes of each other.<br/>Reason : Atoms of $^{50}Ti$ and $^{50}Cr$ have the same mass number. <br/>
Question 79 :
If pressure of a gas contained in a closed vessel is increased by $0.4$% when heated by ${1}^{o}C$ its initial temperature must be:
Question 80 :
$50$% of the reagent is used for dehydrohalogentaion of $6.45gm$ ${ CH }_{ 3 }{ CH }_{ 2 }Cl$. What will be the weight of the main product obtained?<br>(At. mass of $H,C$ and $Cl$ are $1,12$ and $35.5gm/{mole}^{-1}$ respectively)
Question 82 :
Write true or false for the following statements:<br>The Celsius scale is an absolute temperature scale.
Question 83 :
The force which exists between particle of same kind of substance called cohesion force.
Question 84 :
A vessel contains $1.6$ g of dioxygen at STP ($273.15$K, $1$ atm pressure). The gas is now transferred to another vessel at constant temperature, where pressure becomes half of the original pressure. The volume of the new vessel is:
Question 85 :
The relative strength of interionic/ intermolecular forces in decreasing order is :
Question 86 :
When $2$ g of gas A is introduced into an evacuated flask kept at $25^oC$, the pressure was found to be $1$ atm. If $3$ g of another gas B is then added to the same flask containing A, the pressure becomes $1.5$ atm. Assuming ideal behaviour, the ratio of molecular weights $(M_A:M_B)$ is :
Question 87 :
In a $13L$ vessel initially following reaction occur $C(s)+{S}_{2}(g)\rightleftharpoons {CS}_{2}(g)$ by $12g$ $C$, $64g$ ${S}_{2}$, $76g$ ${CS}_{2}$ at ${1027}^{o}C$ temperature then total pressure is:
Question 89 :
At STP, determine the amount of oxygen in liters that can be prepared from the decomposition of $212$ grams of sodium chlorate($1$ mol$=106$g).
Question 90 :
The volume of $HCl$ passed through the solution at ${25}^{o}C$ and $1$ atm is:
Question 91 :
Two liters Duma's bulb contains nitrogen gas at $0.5 atm.$ On adding $0.01\ mol$ of $O_2$ gas it is necessary to cool bulb to a temperature $10^oC$ to maintain the same pressure. The temperature( in Celsius) of Duma's bulb is:
Question 92 :
At STP, a gas that contains $6.02\times 10^{23}$ atoms and it forms diatomic molecules will occupy :
Question 93 :
Which of the following order of molecular force of attraction among given species is incorrect ?
Question 94 : <p>Consider a classroom that is roughly $5m \times  10m \times  3m.$ Initially $T = 27^{\circ}C$ and $P = 1 atm$. There are $50$ people in an insulated class losing energy to the room at the average rate of $150 watt$ per person. How long can they remain in class if the body temperature is ${42^o}C$ and the person feels uncomfortable above this temperature?</p><p>[Molar heat capacity  of air = $(7/2)R$]<br/></p>
Question 95 :
The gaseous reaction $A_{(g)} \rightarrow 2B_{(g)} + C_{(g)}$ is found to be first order with respect to $A$. If the reaction is started with $p_{A} = 90\ mmHg$, the pressure after $10$ minutes found to be $180\ mmHg$. The rate constant of the reaction is?
Question 96 :
A gaseous mixture of ethene, ethane and methane having total volume $150\ ml$ is subjected to combustion in excess of oxygen. If percentage of methane in the original mixture is $20\%$ then calculate volume (in ml) of $C{ O }_{ 2 }\left( g \right)$ which will be obtained at same temperature and pressure.
Question 97 :
When a drop of liquid splits up into a number of drops.
Question 98 :
$0.303$ g of the organic compound in Duma's method on combustion gave $32.27$ ml of moist nitrogen at $27^{\circ}$C and at P mm of Hg pressure. The vapour pressure at $ 27^{\circ}$C is $21$ mm of Hg. Find the value of P.
Question 99 :
In the equation of state of an ideal gas $PV = nRT$, the value of universal gas constant would depend only on:
Question 100 :
Consider a vessel filled with carbodioxide at $27^{\circ}C$ and $5$ atmospheric pressure. A part of the gas is removed at $27^{\circ}C$ and it fills a $3L$ container at $1\ atm$ and the pressure drops to $3.5\ atm$ in the vessel. The volume of the vessel is:
Question 101 :
$0.40\ g$ of helium in a bulb at a temperature of $T\ K$ had a pressure of $p$ atm. When the bulb was immersed in water bath at temperature $50\ K$ more than the first one, $0.08\ g$ of gas had to be removed to restore the original pressure. The temperature $T$ is:
Question 102 :
An open vessel containing air at 27$^o$C is heated to 127$^o$C. The fraction of air originally present in the bottle that is expelled is:
Question 103 :
When $2$ g of gas A is introduced into an evacuated flask kept at $25^oC$, the pressure was found to be $1$ atmosphere. If $3$ g of another gas B is then added to the same flask, the pressure becomes $1.5$ atm. Assuming ideal behaviour, the ratio of molecular weights $(M_B:M_A)$ is :
Question 105 :
Pressure of real gas is less than the pressure of ideal gas because:
