Question 1 : <div>Choose the most appropriate answer:     </div><div>Rising and setting of the sun at a given place is a <br/></div>
Question 2 :
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 3 : <div>Write 'true' or 'false' against the following statement.    </div><div>Earthquake is a desirable change.<br/></div>
Question 4 : <div>Write 'true' or 'false' against the following statement.    </div><div>Rusting of iron is a chemical change.<br/></div><br/>
Question 7 :
_________ is used to measure the pressure of liquids and gases.
Question 9 :
Pressure of a gas mixture of air is measured by ____________.
Question 11 :
A liquid is in equilibrium with its vapour at its boiling point. On the average, the molecules in the two phases have equal:
Question 15 : <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 16 : <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 18 :
The fifth state of matter i.e. Bose-Einstein condensate was proved in:
Question 19 :
The weakest interparticle forces are found in which of the following?
Question 20 : <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 21 :
Solids which are formed by slow cooling will tend to be ________, while solids which are frozen rapidly are more likely to be _________ .
Question 22 :
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 26 : <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 28 : <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 31 :
Which of the following gases is LEAST dense when all are measured under the same conditions?
Question 33 :
$50$% 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 34 :
Which apparatus can be used to introduce more liquid into a reaction and also serve as a pressure valve?
Question 35 :
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 37 :
A quantity of $2$g of hydrogen diffuses from a container is $10$ min. How many grams of oxygen would diffuse through the same container in the same time under similar conditions?
Question 38 :
In which of the following chemical equation, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?
Question 40 :
When $CO_{2}(g)$ is passed over red-hot coke it partially gets reduced to $CO(g)$. Upon passing $0.5$ litre of $CO_{2}(g)$ over red-hot coke, the total volume of the gases increased to $700\ mL$. The composition of the gaseous mixture at STP is :
Question 41 :
Which of the following order of molecular force of attraction given species is incorrect?
Question 43 : The $pH$ of pure water at ${25}^{o}C$ and ${60}^{o}C$ are $7$ and $6.5$ respectively. $HCl$ gas is passed through water at ${25}^{o}C$ till the resulting $1$ litre solution aquires a $pH$ of $3$. Now $4\times {10}^{-3}$ mole of $NaCN$ are added into this solution. Also a fresh $0.1M$ $HCN$ solution has $pH$ $5.1936$. Now in the one part of solution obtained after addition of $NaCN$, one millimole of $NaOH$ are added and in the second part of this solution $0.5$ miili mole of $HCl$ are added.<div>The volume of $HCl$ passed through the solution at ${25}^{o}C$ and $1$ atm is :</div>
Question 44 :
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 46 :
Assertion: Increase in surface area, increase in rate of evaportion
Reason: Stronger the intermolecular attractive forces, fast is the rate of evaporation at a given temperature
Question 47 :
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 48 :
Which of the following will respond to sublimation?<br>1.Sodium chloride 2. Dry ice 3. Naphthalene 4. Ammonium chloride
Question 49 :
When two pieces of ice are pressed together they form a single lump. This happens due to __________.
Question 50 :
Which intermolecular force is most responsible in allowing xenon gas to liquefy?
Question 51 :
Who among the following scientists has not done any important work on gases
Question 52 :
The density of ammonia at $30^oC$ and $5$ atm pressure is:
Question 54 :
Under $STP$,  $22.4$ liters of $N_2(g)$ are made to combine completely with a sufficient quantity of $H_2(g)$. How much volume in litres of $NH_3(g)$ will be produced?<br/>
Question 57 :
A gas $(1g)$ at $4$ bar pressure. If we add $2gm$ of gas $B$ then the total pressure inside the container is $6$ bar. Which of the following is true?
Question 59 :
At what temperature, the volume of '$V'$ of a certain mass of gas at ${37}^{o}C$ be doubled? (keeping pressure constant)
Question 61 :
Write true or false for the following statements:<br>The force of attraction between the constituent particles in any form of matter is known as inter - molecular force.
Question 62 :
At $100^oC$ and $1$ atm, if the density of the liquid water is $1.0\: g\:cm^{-3}$ and that of water vapour is $0.0006$ $g\: cm^{-3}$, then the volume occupied by water molecules in $1$ L of steam at this temperature is :
Question 63 :
Arrange the following in increasing order of their intermolecular forces: <br>Nylon-6,6(I), Buna-S(II), Polythene(III)<br>
Question 64 :
Arrange the following in the increasing order of 'forces of attraction':
Question 66 :
Which of the following statements is correct if the intermolecular forces in liquids $A, B$ and $C$ are in the order $A < B < C$ ?<br/>
Question 68 :
Assertion: Volume: temperature ratio is constant for a fixed amount of gas at constant pressure.
Reason: At constant pressure the volume of a given mass of a gas increases or decreases by $1/273$ of its volume at ${0}^{o}C$
Question 69 :
Write true or false for the following statements:<br>The Celsius scale is an absolute temperature scale.
Question 71 :
With the decrease in thermal energy of gas molecules, attraction and repulsion forces :
Question 72 :
Which of the following can adsorb large volume of hydrogen gas?
Question 73 :
If the Intermolecular space is more than the Intermolecular force will be weaker.
Question 74 :
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 75 :
One litre of a gas is collected at STP. What would be the volume of the same gas at $2$ atmospheric pressure and $27^{\circ}C$:
Question 76 :
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 78 :
What happens when a crystal structure of NaCl type is pressurized?
Question 79 :
The type of intermolecular force that is existing between the molecules of ${\text{BC}}{{\text{l}}_{\text{3}}}$ is
Question 81 :
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 83 :
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 84 :
$0.40\ g$ 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 85 :
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 86 :
The volume of $HCl$ passed through the solution at ${25}^{o}C$ and $1$ atm is:
Question 87 :
The relative strength of interionic/ intermolecular forces in decreasing order is :
Question 88 :
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 89 :
$0.303$ 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 90 :
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 91 :
When a drop of liquid splits up into a number of drops.
Question 92 :
At STP, a gas that contains $6.02\times 10^{23}$ atoms and it forms diatomic molecules will occupy :
Question 93 :
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 94 :
The force which exists between particle of same kind of substance called cohesion force.
Question 95 :
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 96 :
In the equation of state of an ideal gas $PV = nRT$, the value of universal gas constant would depend only on:
Question 97 :
Pressure of real gas is less than the pressure of ideal gas because:
Question 99 :
Which of the following order of molecular force of attraction among given species is incorrect ?
Question 100 :
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 101 :
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 102 :
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 103 :
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 104 : <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>
