States of Matter PYQs Set 3 (PDF)

Set 3 of 8 · Questions 61-90 of 228

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Mere Teacher · Previous Year Questions JEE Main Chemistry · States of Matter · Set 3 (Q61-90)
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61. $An open flask containing air is heated from 300 K to 500 K. What percentage of air will be escaped to the atmosphere, if pressure is keeping constant?$ (1) $80$ (2) $40$ (3) $60$ (4) $20$ 62. $At 300 K and 760 torr pressure, the density of a mixture of He and O_{2} gases is 0.543 gL^{- 1} . The mass percent of oxygen approximately is (R = 0.0821 L atm K^{- 1} mol^{- 1})$ (1) $33$ (2) $80$ (3) $20$ (4) $67$ 63. $Gases deviate from ideal behaviour at high pressures because the gas molecules$ (1) $attract each other$ (2) $repel each other$ (3) $show Brownian motion$ (4) $obey Tyndall effect$ 64. $0.5 mole of each of H_{2}, SO_{2} and CH_{4} are kept in a container. A hole was made in the container. After 3 hours, the order of partial pressures in the container will be$ (1) $p SO_{2} > p CH_{4} > p H_{2}$ (2) $p H_{2} > p SO_{2} > p CH_{4}$ (3) $p H_{2} > p CH_{4} > p SO_{2}$ (4) $p SO_{2} > p H_{2} > p CH_{4}$ 65. $A person living in Shimla observed that, cooking food without using pressure cooker takes more time. The reason is that at high altitude$ (1) $temperature decrease$ (2) $pressure increases A23$ (3) $pressure decreases$ (4) $temperature increases$ 66. $12 cm^{3} of SO_{2} (g) diffused through a porous membrane in 1 minute. Under similar conditions 120 cm^{3} of another gas diffused in 5 minutes. The molar mass of the gas in g mol^{- 1} is$ (1) $32$ (2) $18$ (3) $44$ (4) $16$ 67. $At T (K), equal weights of H_{2}, D_{2}, and T_{2} are present in closed vessel. The pressure exerted by this gaseous mixture is P atm. The ratio of partial pressures of T_{2}, D_{2} and H_{2} is approximately (H, D and T are isotopes of hydrogen).$ (1) $0.33 : 0.33 : 0.33$ (2) $0.18 : 0.27 : 0.54$ (3) $0.25 : 0.50 : 0.25$ (4) $0.54 : 0.27 : 0.18$ 68. $The quantity that does not change for a sample of a gas in a sealed rigid container when it is cooled from 120°C to 90°C at constant volume is$ (1) $average energy of the molecule$ (2) $pressure of the gas$ (3) $density of the gas$ (4) $average speed of the molecules$ 69. $The compressibility factor of a real gas at high pressure is$ (1) $1$ (2) $1 + \frac{RT}{Pb}$ (3) $1 - \frac{RT}{Pb}$ (4) $1 + \frac{Pb}{RT}$ 70. $At 200 K, an ideal gas (X) present in a 1 L flask has a concentration of 1 mol L^{- 1} . At the same temperature, 0.1 mole of X is added into the vessel. What is the final pressure of the gas in atm? (Given R = 0.082 L atom mol^{- 1} K^{- 1})$ (1) $18.04$ (2) $16.4$ (3) $8.2$ (4) $9.02$ 71. $‘a’ and ‘b’ are vander Waals’ constants for gases. Chlorine is more easily liquefied than ethane because:$ (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) $a for C l_{2} > a for C_{2} H_{6} but b for C l_{2} < b for C_{2} H_{6}$ 72. $Which of the following will not give a straight line plot for an ideal gas ?$ (1) $V vs T$ (2) $T vs P$ (3) $V vs I/P$ (4) $V vs I/T$ 73. $The compressibility factor (Z) of a gas at critical state is (T_{c} = \frac{8 a}{27 R b}; p_{c} = \frac{a}{27 b ^{2}}; V_{c} = 3 b)$ (1) $\frac{8}{3}$ (2) $1$ (3) $\frac{3}{8}$ (4) $0.5$ 74. $Which of the following statements is incorrect? 1. The property of liquid drops to have minimum surface area is called surface tension. 2.Surface tension of liquids decreases with rise in temperature. 3. The SI unit of surface tension in Nm^{- 1} . 4.Magnitude of surface tension is less, when there is strong attractive force between the molecules.$ (1) $1$ (2) $2$ (3) $3$ (4) $4$ 75. $The pressure of real gases is less than that of ideal gas because of$ (1) $increase in the kinetic energy of the molecules$ (2) $intermolecular attraction$ (3) $finite size of particles$ (4) $increase in the number of collisions.$ 76. $One mole of oxygen at 273 K and one mole of sulphur dioxide at 546 K are taken in two separate containers, then$ (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) $none of these.$ 77. $In vander Waal’s equation of state of the gas law, the constant ‘b’ is a measure of$ (1) $Intermolecular collisions per unit volume$ (2) $Intermolecular attractions$ (3) $Volume occupied by the molecules$ (4) $Intermolecular repulsions$ 78. $If the most probable speed of CO_{2} at 27^{\circ} C is 400 ms^{- 1} . The root mean square velocity of CO_{2} at the same temperature in ms^{- 1} is approximately$ (1) $600$ (2) $490$ (3) $267$ (4) $245$ 79. $10 L of O_{2} gas is reacted with 30 L of CO (g) at STP. The volume of each gas present at the end of the reaction are :$ (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) $CO = 15 L, C O_{2} = 15 L$ 80. $For a reaction, N_{2} O_{5 (g)} \to 2 NO_{2 (g)} + \frac{1}{2} O_{2 (g)} in a constant volume container, no products were present initially. The final pressure of the system when 50 % of reaction gets completed is$ (1) $5 times of initial pressure$ (2) $5/2 times of initial pressure$ (3) $7/2 times of initial pressure$ (4) $7/4 times of initial pressure$ 81. $Density of C O_{2} gas at 0ºC and 2.00 atm pressure can be expressed as$ (1) $2 g m^{-3}$ (2) $4 g m^{-3}$ (3) $4 \times 1 0^{3} kg m^{-3}$ (4) $None$ 82. $A cold drink bottle contains 200 mL liquid in which CO_{2} is 0.1 molar. Considering CO_{2} as an ideal gas, the volume of the dissolved CO_{2} at S.T.P. is$ (1) $22.4 L$ (2) $0.224 L$ (3) $2.24 L$ (4) $0.448 L$ 83. $A, B, C and D are four different gases with critical temperatures 304.1, 154.3, 405.5 and 126.0 K respectively. While cooling the gas, which gets liquefied first?$ (1) $B$ (2) $A$ (3) $D$ (4) $C$ 84. $Which of the following gases has the maximum van der Waal's constant 'a'?$ (1) $H_{2}$ (2) $He$ (3) $CO_{2}$ (4) $NH_{3}$ 85. $Two non reacting gas A & B having mole ratio of 3 : 5 in a container exerts a pressure of 8 atm. If B is removed what would be pressure of ‘A’ only. If A is removed what would be pressure of ‘B’ only, temperature remaining constant.$ (1) $3 atm$ (2) $4 atm$ (3) $5 atm$ (4) $None of these$ 86. $At 300 K, the compressibility factor of 1 mole of a gas is 1.1. Its pressure is 2.706 atm . What is its volume in L ? (Given R = 0.082 L atm mol^{- 1} K^{- 1}).$ (1) $1$ (2) $10$ (3) $100$ (4) $0.1$ 87. $A gas described by van der Waals equation$ (1) $behaves similar to an ideal gas in the limit of large molar volumes$ (2) $behaves similar to an ideal gas is in limit of large pressures$ (3) $is characterised by van der Waals coefficients that are dependent on the identity of the gas but are independent of the temperature.$ (4) $has the pressure that is lower than the pressure exerted by the same gas behaving ideally$ 88. $3.12 g of oxygen is adsorbed on 1.2 g of platinum metal. The value of oxygen adsorbed per gram of theadsorbent at 1 atm and 300 K in is ____(R = 0.082 L atm K^{- 1} mo l^{- 1})$ 89. $The volume occupied by 4.75 g of acetylene gas at 50°C and 740 mmHgpressure is ____ L. (Rounded off to the nearest integer) (Given R = 0.0826 L atm K^{- 1} mol^{- 1})$ 90. $At 600 K, the root mean square (rms) speed of gas X (molar mass = 40) is equal to the most probable speed of gas Y at 90 K. The molar mass of the gas Y is g mol^{- 1} . (Nearest integer)$