States of Matter PYQs Set 2 (PDF)

Set 2 of 7 · Questions 31-60 of 196

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Mere Teacher · Previous Year Questions NEET Chemistry · States of Matter · Set 2 (Q31-60)
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31. $If V_{0} is the volume of a given mass of gas at 273 K at constant pressure, then according to Charle's law, the volume at 10ºC will be :$ (1) $10 V_{0}$ (2) $\frac{2}{273} (V_{0} + 10)$ (3) $V_{0} + \frac{10}{273}$ (4) $\frac{283}{273} V_{0}$ 32. $The vapors of 1 g of an element occupy 2.5625 L exerting a pressure of 0.5 atm at 1000 K . What is the molar mass (in g mol^{- 1}) of the element? (Assume vapors follow ideal gas equation. Given R = 0.082 L atm mol^{- 1} K^{- 1})$ (1) $64$ (2) $16$ (3) $32$ (4) $128$ 33. $4.4 grams of a gas at 0^{\circ} C and 0.82 atm pressure occupies a volume of 2.73 L. The gas can be$ (1) $O_{2}$ (2) $CO$ (3) $NO_{2}$ (4) $CO_{2}$ 34. $Arrange the following gases in increasing order of van der Waals constant 'a' (A) Ar (B) CH_{4} (C) H_{2} O (D) C_{6} H_{6} Choose the correct option from the following.$ (1) $D, C, B and A$ (2) $A, B, C and D$ (3) $B, C, D and A$ (4) $C, D, B and A$ 35. $Which of the following describes an ideal gas? (i) The volume occupied by a gas molecule is negligible. (ii) The collision between ideal gases are elastic. (iii) Particles are very small compared to the distance between each other.$ (1) $(i) and (ii) only$ (2) $(i) and (iii) only$ (3) $(ii) and (iii) only$ (4) $(i), (ii) and (iii) only$ 36. $For an ideal gas, compressibility factor is$ (1) $0$ (2) $1$ (3) $-1$ (4) $+2$ 37. $When the absolute temperature of ideal gas is doubled and pressure is halved, the volume of gas$ (1) $will be half of the original volume$ (2) $will be 4 times the original volume$ (3) $will be 2 times the original volume$ (4) $will be 1/4 th times the original volume.$ 38. $The pressure inside two gas cylinders of volume 25 m^{3} and 50 m^{3} are 10 kPa and 20 kPa respectively. The cylinders are kept at the same temperature and separated by a valve. What is the pressure in the combined system when the vale is opened?$ (1) $30 kPa$ (2) $15 kPa$ (3) $16.7 kPa$ (4) $2.5 kPa$ 39. $1 mole of a real gas is kept at high pressure of 100 bar at 300 K . If van der Waals constant b is 0.005 L / mol, what are the values of compressibility factor Z of the gas and % deviation of volume from ideality? Z %Deviation$ (1) $1.10 10$ (2) $1.2 20$ (3) $1.02 2$ (4) $1.2 15$ 40. $A vessel of volume 24.6 L contains 1.5 moles of H_{2} and 2.5 moles of N_{2} at 300 K . Calculate the partial pressure of N_{2} in the vessel.$ (1) $1.5 atm$ (2) $2.0 atm$ (3) $2.5 atm$ (4) $3.0 atm$ 41. $A beaker is heated from 27°C to 127°C, the percentage of air originally present in beaker that is expelled is:$ (1) $50%$ (2) $25%$ (3) $33%$ (4) $40%$ 42. $Which among the following statements is correct? A. There is a complete order of molecules in gases. B. There is a complete disorder of molecules in gases. C. Molecules are not always in random motion in gases. D. Molecules are fixed at respective position in gases.$ (1) $A$ (2) $B$ (3) $C$ (4) $D$ 43. $At T (K), a gaseous mixture of H_{2} and O_{2} containing 20 % (weight/weight) of H_{2} exerts a total pressure of 2 bar. What is the partial pressure of O_{2} (in bar)?$ (1) $0.2$ (2) $0.1$ (3) $0.4$ (4) $0.6$ 44. $Identify the correct statements from the following(A) The compressibility factor (Z) for an ideal gas is 1(B) Urananium isotopes (^{235} U) and (^{238} U) are separated by converting them into UF_{6} vapours(C) Decrease in temperature increases the kinetic energy of gas molecules$ (1) $A, B, C$ (2) $A, C only$ (3) $B, C only$ (4) $A, B only$ 45. $The rms velocity of hydrogen is 7 times the rms velocity of nitrogen. If T is the temperature of the gas, which of the following is true?$ (1) $T_{N_{2}} = T_{H_{2}}$ (2) $T_{H_{2}} = 7 T_{N_{2}}$ (3) $T_{N_{2}} = 2 T_{H_{2}}$ (4) $T_{N_{2}} = 7 T_{H_{2}}$ 46. $The van der Waals equation for one mole of a real gas can be written as (P + a/ V^{2}) (V - b) = RT. For the gases H_{2}, N H_{3}, and C H_{4}, the value of 'a' (bar L^{-2} m o l^{-2}) are 0.2453, 4.170 and 2.253 respectively. Which of the following can be inferred from the 'a' values ?$ (1) $N H_{3} can be most easily liquified$ (2) $H_{2} can be most easily liquified$ (3) $value of 'a' for C H_{4} is less than that of N H_{3} because it has the lower molar mass$ (4) $intermolecular forces are the strongest in hydrogen$ 47. $Density of carbon monoxide is maximum at$ (1) $2 atm and 600 K$ (2) $0.5 atm and 273 K$ (3) $6 atm and 1092 K$ (4) $4 atm and 500 K .$ 48. $What is the density of water vapour at boiling point of water?$ (1) $1 \times 10^{- 4} g cm^{- 3}$ (2) $6 \times 10^{- 4} g cm^{- 3}$ (3) $1 g cm^{- 3}$ (4) $4 \times 10^{- 4} g cm^{- 3}$ 49. $On the top of a mountain, water boils at$ (1) $high temperature$ (2) $same temperature$ (3) $high pressure$ (4) $low temperature$ 50. $The van der Waals' equation for 0.5 mol of a gas is$ (1) $(ρ + \frac{a}{4 V ^{2}}) (\frac{V - b}{2}) = RT$ (2) $(ρ + \frac{a}{4 V ^{2}}) (2 V - b) = RT$ (3) $(ρ + \frac{a}{4 V ^{2}}) (2 V - 4 b) = RT$ (4) $(ρ + \frac{a}{4 V ^{2}}) = \frac{2 RT}{2 ( V - b )}$ 51. $Consider the following table: Gas a/ (k Pa dm^{6} mo l^{- 1}) b/ (dm^{3} mo l^{- 1}) A 642.32 0.05196 B 155.21 0.04136 C 431.91 0.05196 D 155.21 0.4382 a and b are van der waals constants. The correct statement about the gases is :$ (1) $Gas C will occupy more volume than gas A; gas B will be more compressible than gas D$ (2) $Gas C will occupy lesser volume than gas A; gas B will be lesser compressible than gas D$ (3) $Gas C will occupy more volume than gas A; gas B will be lesser compressible than gas D$ (4) $Gas C will occupy lesser volume than gas A; gas B will be more compressible than gas D$ 52. $The following data is obtained for one mole of a gas The gas behaves as an ideal gas in the pressure range (in bar) P(bar) \frac{PV}{RT} 1121314 1.5 5 2.0$ (1) $1 to 3$ (2) $1 to 5$ (3) $4 to 5$ (4) $Above 5$ 53. $Certain volume of oxygen gas diffuses through a porous pot in 20 seconds. Same volume of another gas (X) diffuses in Y seconds as that of oxygen, then (X) and Y respectively are$ (1) $H_{2}, 5$ (2) $He, 10$ (3) $CO, 30$ (4) $CO_{2}, 40$ 54. $An open flask containing air is heated from 300 K to 500 K. What percentage of air will be escaped to the atmosphere, if pressure is keeping constant?$ (1) $80$ (2) $40$ (3) $60$ (4) $20$ 55. $At 300 K and 760 torr pressure, the density of a mixture of He and O_{2} gases is 0.543 gL^{- 1} . The mass percent of oxygen approximately is (R = 0.0821 L atm K^{- 1} mol^{- 1})$ (1) $33$ (2) $80$ (3) $20$ (4) $67$ 56. $Gases deviate from ideal behaviour at high pressures because the gas molecules$ (1) $attract each other$ (2) $repel each other$ (3) $show Brownian motion$ (4) $obey Tyndall effect$ 57. $0.5 mole of each of H_{2}, SO_{2} and CH_{4} are kept in a container. A hole was made in the container. After 3 hours, the order of partial pressures in the container will be$ (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) $p SO_{2} > p H_{2} > p CH_{4}$ 58. $A person living in Shimla observed that, cooking food without using pressure cooker takes more time. The reason is that at high altitude$ (1) $temperature decrease$ (2) $pressure increases A23$ (3) $pressure decreases$ (4) $temperature increases$ 59. $12 cm^{3} of SO_{2} (g) diffused through a porous membrane in 1 minute. Under similar conditions 120 cm^{3} of another gas diffused in 5 minutes. The molar mass of the gas in g mol^{- 1} is$ (1) $32$ (2) $18$ (3) $44$ (4) $16$ 60. $At T (K), equal weights of H_{2}, D_{2}, and T_{2} are present in closed vessel. The pressure exerted by this gaseous mixture is P atm. The ratio of partial pressures of T_{2}, D_{2} and H_{2} is approximately (H, D and T are isotopes of hydrogen).$ (1) $0.33 : 0.33 : 0.33$ (2) $0.18 : 0.27 : 0.54$ (3) $0.25 : 0.50 : 0.25$ (4) $0.54 : 0.27 : 0.18$