States of Matter PYQs Set 3 (PDF)

Set 3 of 7 · Questions 61-90 of 196

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Mere Teacher · Previous Year Questions NEET Chemistry · States of Matter · Set 3 (Q61-90)
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61. $The quantity that does not change for a sample of a gas in a sealed rigid container when it is cooled from 120°C to 90°C at constant volume is$ (1) $average energy of the molecule$ (2) $pressure of the gas$ (3) $density of the gas$ (4) $average speed of the molecules$ 62. $The compressibility factor of a real gas at high pressure is$ (1) $1$ (2) $1 + \frac{RT}{Pb}$ (3) $1 - \frac{RT}{Pb}$ (4) $1 + \frac{Pb}{RT}$ 63. $At 200 K, an ideal gas (X) present in a 1 L flask has a concentration of 1 mol L^{- 1} . At the same temperature, 0.1 mole of X is added into the vessel. What is the final pressure of the gas in atm? (Given R = 0.082 L atom mol^{- 1} K^{- 1})$ (1) $18.04$ (2) $16.4$ (3) $8.2$ (4) $9.02$ 64. $‘a’ and ‘b’ are vander Waals’ constants for gases. Chlorine is more easily liquefied than ethane because:$ (1) $a and b for C l_{2} > a and b for C_{2} H_{6}$ (2) $a and b for C l_{2} < a and b for C_{2} H_{6}$ (3) $a and C l_{2} < a for C_{2} H_{6} but b for C l_{2} > b for C_{2} H_{6}$ (4) $a for C l_{2} > a for C_{2} H_{6} but b for C l_{2} < b for C_{2} H_{6}$ 65. $Which of the following will not give a straight line plot for an ideal gas ?$ (1) $V vs T$ (2) $T vs P$ (3) $V vs I/P$ (4) $V vs I/T$ 66. $The compressibility factor (Z) of a gas at critical state is (T_{c} = \frac{8 a}{27 R b}; p_{c} = \frac{a}{27 b ^{2}}; V_{c} = 3 b)$ (1) $\frac{8}{3}$ (2) $1$ (3) $\frac{3}{8}$ (4) $0.5$ 67. $Which of the following statements is incorrect? 1. The property of liquid drops to have minimum surface area is called surface tension. 2.Surface tension of liquids decreases with rise in temperature. 3. The SI unit of surface tension in Nm^{- 1} . 4.Magnitude of surface tension is less, when there is strong attractive force between the molecules.$ (1) $1$ (2) $2$ (3) $3$ (4) $4$ 68. $The pressure of real gases is less than that of ideal gas because of$ (1) $increase in the kinetic energy of the molecules$ (2) $intermolecular attraction$ (3) $finite size of particles$ (4) $increase in the number of collisions.$ 69. $One mole of oxygen at 273 K and one mole of sulphur dioxide at 546 K are taken in two separate containers, then$ (1) $kinetic energy of both are equal$ (2) $kinetic energy of O_{2} < kinetic energy of SO_{2}$ (3) $kinetic energy of O_{2} > kinetic energy of SO_{2}$ (4) $none of these.$ 70. $In vander Waal’s equation of state of the gas law, the constant ‘b’ is a measure of$ (1) $Intermolecular collisions per unit volume$ (2) $Intermolecular attractions$ (3) $Volume occupied by the molecules$ (4) $Intermolecular repulsions$ 71. $If the most probable speed of CO_{2} at 27^{\circ} C is 400 ms^{- 1} . The root mean square velocity of CO_{2} at the same temperature in ms^{- 1} is approximately$ (1) $600$ (2) $490$ (3) $267$ (4) $245$ 72. $10 L of O_{2} gas is reacted with 30 L of CO (g) at STP. The volume of each gas present at the end of the reaction are :$ (1) $O_{2} = 10 L, C O_{2} = 20 L$ (2) $CO = 10 L, C O_{2} = 20 L$ (3) $CO = 20 L, C O_{2} = 10 L$ (4) $CO = 15 L, C O_{2} = 15 L$ 73. $For a reaction, N_{2} O_{5 (g)} \to 2 NO_{2 (g)} + \frac{1}{2} O_{2 (g)} in a constant volume container, no products were present initially. The final pressure of the system when 50 % of reaction gets completed is$ (1) $5 times of initial pressure$ (2) $5/2 times of initial pressure$ (3) $7/2 times of initial pressure$ (4) $7/4 times of initial pressure$ 74. $Density of C O_{2} gas at 0ºC and 2.00 atm pressure can be expressed as$ (1) $2 g m^{-3}$ (2) $4 g m^{-3}$ (3) $4 \times 1 0^{3} kg m^{-3}$ (4) $None$ 75. $A cold drink bottle contains 200 mL liquid in which CO_{2} is 0.1 molar. Considering CO_{2} as an ideal gas, the volume of the dissolved CO_{2} at S.T.P. is$ (1) $22.4 L$ (2) $0.224 L$ (3) $2.24 L$ (4) $0.448 L$ 76. $A, B, C and D are four different gases with critical temperatures 304.1, 154.3, 405.5 and 126.0 K respectively. While cooling the gas, which gets liquefied first?$ (1) $B$ (2) $A$ (3) $D$ (4) $C$ 77. $Which of the following gases has the maximum van der Waal's constant 'a'?$ (1) $H_{2}$ (2) $He$ (3) $CO_{2}$ (4) $NH_{3}$ 78. $At 300 K, the compressibility factor of 1 mole of a gas is 1.1. Its pressure is 2.706 atm . What is its volume in L ? (Given R = 0.082 L atm mol^{- 1} K^{- 1}).$ (1) $1$ (2) $10$ (3) $100$ (4) $0.1$ 79. $The vapour density of gas A is four times that of B. If the molecular mass of B is M then molecular mass of A is:$ (1) $M$ (2) $4M$ (3) $M/4$ (4) $2M$ 80. $What is the approximate most probable velocity of oxygen? If the kinetic energy of one mole of oxygen is 3741.3 J .$ (1) $43851 J kg^{- 1}$ (2) $48321 J kg^{- 1}$ (3) $155887 J kg^{- 1}$ (4) $3950 J kg^{- 1}$ 81. $16 g each of H_{2}, He and O_{2} are present in a container exerting 10 atm . pressure at T (K) . The pressure in atm exerted by 16 g each of He and O_{2} in the second container of same volume and temperature is$ (1) $1.8$ (2) $6.4$ (3) $3.6$ (4) $5.4$ 82. $If all the oxygen atoms present in 4 mole H_{2} S O_{4}, 2 mole P_{4} O_{10} & 2mole N O_{2} are collected for the formation of O_{2} gas molecules then calculate volume of O_{2} gas formed at 2 atm pressure & 273 K temperature.$ (1) $224 L$ (2) $448 L$ (3) $336 L$ (4) $112 L$ 83. $The term that corrects for the attractive forces present in a real gas in the vander Waals equation is :$ (1) $nb$ (2) $\frac{a n ^{2}}{V ^{2}}$ (3) $- \frac{a n ^{2}}{V ^{2}}$ (4) $-nb$ 84. $Two flasks A and B have equal volumes. A is maintained at 300 K and B at 600 K, while A contains H_{2} gas, B has an equal mass of C O_{2} gas. Find the ratio of total K.E. of gases in flask A to that of B.$ (1) $1 : 2$ (2) $11 : 1$ (3) $33 : 2$ (4) $55 : 7$ 85. $The density of a gas at 27^{\circ} C and 1 atm is d . Pressure remaining constant, at which of the following temperatures will its density become 0.75 d ?$ (1) $20^{\circ} C$ (2) $30^{\circ} C$ (3) $400 K$ (4) $300 K$ 86. $Two containers A and B contain CO_{2} gas. Pressure, volume and absolute temperature of the gas in A are 4 times more compared to that in B . The mass of the gas in B is x g, then the mass of the gas in A will be$ (1) $\frac{x}{2} g$ (2) $4 xg$ (3) $2 xg$ (4) $16 xg$ 87. $The rates of diffusion of SO_{2}, CO_{2}, PCl_{3} and SO_{3} are in the following order$ (1) $CO_{2} > SO_{2} > PCl_{3} > SO_{3}$ (2) $PCl_{3} > SO_{3} > SO_{2} > CO_{2}$ (3) $SO_{2} > SO_{3} > PCl_{3} > CO_{2}$ (4) $CO_{2} > SO_{2} > SO_{3} > PCl_{3}$ 88. $20 mL of gas A and 10 mL of gas B diffuses through a porous membrane separately in 1 minute. If the vapor density of B is X, what is the vapor density of A?$ (1) $2 x$ (2) $4 x$ (3) $\frac{x}{4}$ (4) $\frac{x}{2}$ 89. $Diffusion of CH_{4} (g) and O_{2} (g) occurs under similar conditions, then the ratio of their rates of diffusion is$ (1) $1.414$ (2) $0.707$ (3) $2.312$ (4) $1.732$ 90. $One mole of a monoatomic real gas satisfies the equation p(V - b) = RT where b is a constant. The relationship of interatomic potential V(r) and interatomic distance r for the gas is given by$ (1) (2) (3) (4)