States of Matter PYQs Set 1 (PDF)

Set 1 of 7 · Questions 1-30 of 196

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Mere Teacher · Previous Year Questions NEET Chemistry · States of Matter · Set 1 (Q1-30)
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1. $The most probable velocity of a gas at 7200 K is equal to the RMS velocity of He gas at 27^{\circ} C . The gas is$ (1) $O_{2}$ (2) $CO$ (3) $N_{2}$ (4) $SO_{2}$ 2. $What is the total pressure exerted by the mixture of 7.0 g of N_{2}, 2 g of hydrogen and 8.0 g of sulphur dioxide gases in a vessel of 6 L capacity that has been kept in a reservoir at 27°C?$ (1) $2.5 bar$ (2) $4.5 bar$ (3) $10 atm$ (4) $5.7 bar$ 3. $The standard molar enthalpy of vaporisation (Δ_{vap} H^{\circ}) of A, B and C liquids is 23.3, 41 and 29 kJ mol^{- 1} respectively. The correct order of dipole-dipole attractive forces in these liquids is:$ (1) $B > C > A$ (2) $B > A > C$ (3) $A > C > B$ (4) $A > B > C$ 4. $Which one of the following is the wrong statement about the liquid?$ (1) $It has intermolecular force of attraction$ (2) $Evaporation of liquids increase with the decrease of surface area$ (3) $It resembles a gas near the critical temperature$ (4) $It is an intermediate state between gaseous and solid state$ 5. $A gas deviates from ideal behaviour at a high pressure because its molecules$ (1) $have kinetic energy$ (2) $are bound by covalent bonds$ (3) $attract one another$ (4) $show the Tyndall effect.$ 6. $At T (K), an ideal gas (Z) present in VL flask exerted a pressure of 16.4 atm . Its concentration is 1 mol L^{- 1} . What is the value of T in K ?$ (1) $100$ (2) $400$ (3) $300$ (4) $200$ 7. $Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Activated charcoal adsorbs S O_{2} more efficiently than C H_{4} . Reason R : Gases with lower critical temperatures are readily adsorbed by activated charcoal. In the light of the above statements, choose the correct answer from the options given below.$ (1) $Both A and R are correct and R is the correct explanation of A.$ (2) $Both A and R are correct but R is NOT the correct explanation of A.$ (3) $A is correct but R is not correct.$ (4) $A is not correct but R is correct.$ 8. $10 moles of an ideal gas present in 8.21 litre container at constant temperature. The intercept on y-axis and slope of curve plotted between P/T vs T.$ (1) $0.01, 0$ (2) $0.1, 1$ (3) $0.1, 0$ (4) $10, 1$ 9. $A gaseous mixture of 2 moles of A, 3 moles of B, 5 moles of C and 10 moles of D contained in a vessel. Assuming that gases are ideal and partial pressure of C is 1.5 atm, the total pressure is$ (1) $15 atm$ (2) $10 atm$ (3) $3 atm$ (4) $6 atm$ 10. $1 mole of gas A and 1 mole of gas B at 27^{\circ} C were pumped into a 24.6 L . Volume pre-evacuated isolated flask. The catalyst coated inside the flask catalyses the following reaction A (g) + B (g) ⟶ 2 D (g) . The kinetic energy of D is 98.03 L atm . Calculate the pressure realised at the end of the reaction.$ (1) $1.66 atm$ (2) $2.66 atm$ (3) $5.33 atm$ (4) $4.33 atm$ 11. $For one mole of an ideal gas, increasing the temperature from 10^{\circ} C to 20^{\circ} C$ (1) $increases the average kinetic energy by two times$ (2) $increases the rms velocity by 2 times$ (3) $increases the rms velocity by two times$ (4) $increases both the average kinetic energy and rms velocity, but not significantly.$ 12. $In order to increase the volume of a gas by 10 %, the pressure of the gas should be$ (1) $decreased by 10 %$ (2) $decreased by 1 %$ (3) $increased by 10 %$ (4) $increased by 1 %$ 13. $If the kinetic energy of O_{2} gas is 4.0 kJ mol^{- 1}, its RMS speed in cm s^{- 1} is$ (1) $5.0 \times 10^{2}$ (2) $5.0 \times 10^{3}$ (3) $5.0 \times 10^{4}$ (4) $5.0\times105$ 14. $0.5 moles of gas A and x moles of gas B exert a pressure of 200 Pa in aa container of volume 10 m^{3} at 1000 K. Given R is the gas constant in JK^{- 1} mol^{- 1}, x is:$ (1) $\frac{2 R}{4 + R}$ (2) $\frac{2 R}{4 - R}$ (3) $\frac{4 + R}{2 R}$ (4) $\frac{4 - R}{2 R}$ 15. $A gas obeys Charles law in the temperature range 0-500 K at a given pressure. Its volume changes to zero at temperature of$ (1) $273.15^{\circ} C$ (2) $0^{\circ} C$ (3) $- 273.15^{\circ} C$ (4) $500 K$ 16. $The rate of diffusion of a gas A is 5 times more than that of gas B . If the molar mass of A is xg mol^{- 1}, the molar mass of B () in (g mol^{- 1}) is$ (1) $4 x$ (2) $5 x$ (3) $16 x$ (4) $25 x$ 17. $The density of gas A is twice that of B at the same temperature the molecular weight of gas B is twice that of A.The ratio of pressure of gas A and B will be :$ (1) $1 : 6$ (2) $1 : 1$ (3) $4 : 1$ (4) $1 : 4$ 18. $Liquor ammonia bottles are opened only after cooling. This is because it$ (1) $is a mild explosive$ (2) $is a corrosive liquid$ (3) $is a lachrymatory$ (4) $none of the above$ 19. $Which one of the following is the kinetic energy of a gaseous mixture containing 3 g of hydrogen and 80 g of oxygen at temperature T (K) ?$ (1) $3 RT$ (2) $6 RT$ (3) $4 RT$ (4) $8 RT$ 20. $The volume of 2.8 g of CO at 27^{\circ} C and 0.821 atm pressure is (R = 0.08210 lit atm (K^{- 1} mol^{- 1})$ (1) $3 litres$ (2) $30 litres$ (3) $0.3 litres$ (4) $1.5 litres$ 21. $Which among the following statements is/are incorrect regarding real gases? (i) Their compressibility factor is never equal to unity (Z \neq = 1) . (ii) The deviations from ideal behaviour are less at low pressure and high temperatures. (iii) Intermolecular forces among gas molecules are equal to zero. (iv) They obey van der Waal's equation, pV = nRT$ (1) $(i), (ii) and (iv)$ (2) $(ii) and (iv)$ (3) $Only (ii)$ (4) $(iii) and (iv)$ 22. $At 300 K, the density of a certain gaseous molecule at 2 bar is double to that of dinitrogen (N_{2}) at 4 bar. The molar mass of gaseous molecule is :$ (1) $56 g m o l^{-1}$ (2) $112 g m o l^{-1}$ (3) $224 g m o l^{-1}$ (4) $28 g m o l^{-1}$ 23. $The most probable speed of O_{2} molecules at T (K) is$ (1) $\frac{RT}{4 π}$ (2) $\frac{RT}{16 π}$ (3) $\frac{RT}{16}$ (4) $\frac{3 RT}{32}$ 24. $A balloon filled with an air sample occupies 3 L volume at 35^{\circ} C . On lowering the temperature to T, the volume decreases to 2.5 L . The temperature T is? [Assume p-constant]$ (1) $16^{\circ} C$ (2) $- 16^{\circ} C$ (3) $24^{\circ} C$ (4) $- 20^{\circ} C$ 25. $When does a gas deviate the most from its ideal behaviour ?$ (1) $At low pressure and low temperature$ (2) $At low pressure and high temperature$ (3) $At high pressure and low temperature$ (4) $At high pressure and high temperature$ 26. $A mixture of one mole each of H_{2}, He and O_{2} each are enclosed in a cylinder of volume V at temperature T. If the partial pressure of H_{2} is 2 atm, the total pressure of the gases in the cylinder is$ (1) $14 atm$ (2) $38 atm$ (3) $22 atm$ (4) $6 atm$ 27. $At T (K) and pressure P, the diffusion rate of an ideal gas is 120 mL min^{- 1} . What is the time taken (in sec.) for 3000 mL of this gas for diffusion at same temperature and pressure?$ (1) $25$ (2) $1500$ (3) $250$ (4) $150$ 28. $If Z is a compressibility factor, vander Waals equation at low pressure can be written as :$ (1) $Z = 1 + \frac{R T}{P b}$ (2) $Z = 1 - \frac{a}{V R T}$ (3) $Z = 1 - \frac{P b}{R T}$ (4) $Z = 1 + \frac{P b}{R T}$ 29. $25 g of each of the following gases are taken at 27^{\circ} C and 600 mm pressure. Which of these will have the least volume?$ (1) $HBr$ (2) $HCl$ (3) $HF$ (4) $HI$ 30. $What is the correction term in the pressure for real gas in comparison to the ideal gas?$ (1) $\frac{n ^{2}}{V ^{2}}$ (2) $\frac{a V ^{2}}{n ^{2}}$ (3) $\frac{a n ^{2}}{V ^{2}}$ (4) $\frac{a n ^{2}}{V} - nb$