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REACH OUT ACME OF SUCCESS, KKMISHRA.ORG, , K.K.MISHRA CLASSES 2021-22, Time : 60 Min, , States of Matter Gaseous and Liquids, , 01) Internal energy and pressure of a gas per unit, volume are related as, 1) P  2E, 2), , P, , 1, E, 2, , 2, P E, 3, 3), 3, P E, 2, 4), 02) Among the following gases which one has the, o, lowest root mean square velocity at 25 C ?, 1) Cl2, 2) O2, 3) N2, SO2, 4), 03) Helium atom is two times heavier than a, hydrogen molecule at 298 K, the average kinetic, energy of helium is, 1) same as that of a hydrogen molecule., 2) two times that of a hydrogen molecule., 3) four times that of a hydrogen molecule., 4) half that of a hydrogen molecule., , 1), 2), 3), 4), , Marks : 200, , 1/4, 1, 2, 4, , o, 08) At 27 C , the ratio of r. m. s. velocities of ozone, to oxygen is, 1) 0.25, 2/3, 2), 3 /5, 3), 4/3, 4), , 09) A gas diffuses 1/5 times as fast as hydrogen., Its molecular weight is, 1) 50 2, 2) 25 2, 3) 50, 4) 25, 10) At STP, 0.50 mol H2 gas and 1.0 mol He gas, 1) have equal effusion rates., 2) occupy equal volumes., 3) have equal molecular speeds., 4) have equal average kinetic energies., , 04) The rate of diffusion of methane at a given, temperature is twice that of X. The molecular, weight of X is, 1) 80.0, 2) 64.0, 3) 40.0, 4) 32.0, , 11) At the same temperature and pressure, which, of the following gases will have the highest kinetic, energy per mole?, 1) Oxygen, 2) Hydrogen, 3) Methane, 4) All the same, , 05) The average kinetic energy of an ideal gas per, o, molecule in SI units at 25 C will be, , 12) At constant temperature and pressure which, gas will diffuse first H2 or O2 ?, , 1), 2), 3), 4), , 6.17  1020 J, , 6.17  1020 kJ, 6.17  1021 J, 6.17  1021 kJ, , 06) Absolute zero is defined as the temperature, 1) at which ether boils., 2) at which all molecular motion ceases., 3) at which liquid helium boils., 4) all of the above., 07) The ratio between the root mean square, O, velocity of H2 at 50 K and that of 2 at 800 K is, , 1), 2), 3), 4), , Oxygen, Hydrogen, Both will diffuse in same time, None of the above, , 13) Choose the correct arrangement, where the, symbols have their usual meanings., u  urms  u, 1) p, u  u  urms, 2) p, u,  u  up, 3) rms, u  up  urms, 4), 14) Which of the following is true about gaseous, , PHYSICS & CHEMISTRY BY KKMISHRA FOR NEET/JEE-MAIN/ADVANCED , @KKMISHRA CLASSESS, NAGPUR

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K.K.MISHRA CLASSES, state?, 1) Molecular forces >> Those in liquids, 2) Thermal energy << Molecular attraction, 3) Thermal energy = Molecular attraction, 4) Thermal energy >> Molecular attraction, 15) The ratio, 1) 2.13, 2) 1.99, 3) 1.66, 4) 1.33, ,  for inert gases is, , 16) With increase of pressure, the mean free path, 1) increases., 2) decreases., 3) does not change., 4) becomes zero., 17) Which one of the following statements is NOT, true about the effect of an increase in temperature, on the distribution of molecular speeds in a gas?, 1) The area under the distribution curve remains, the same as under the lower temperature., 2) The distribution becomes broader., 3) The fraction of the molecules with the most, probable speed increases., 4) The most probable speed increases., 18) If the four tubes of a car are filled to the same, pressure with N2 , O2 , H2 and Ne separately, then, which one will be filled first?, 1) Ne, 2) H2, 3), , O2, , 4), , N2, , 19) Which of the following expressions correctly, represents the relationship between the average, N, molar kinetic energy, K.E. , of CO and 2, molecules at the same temperature?, KECO  KEN2, 1), KECO  KEN2, 2), KECO  KEN2, 3), 4) Cannot be predicted unless the volumes of the, gases are given., 20) A certain sample of gas has a volume of 0.2, o, litre measured at 1 atm pressure and 0 C . At the, o, same pressure but at 273 C , its volume will be, 1) 55.6 litres, 2) 27.8 litres, 3) 0.8 litres, 4) 0.4 litres, , 21) Which is not true in case of an ideal gas?, 1) At a given temperature, PV is proportional to the, amount of the gas., 2) All molecules of the gas move with same speed., , 3) There is no interaction between the molecules., 4) It cannot be converted into a liquid., 22) Consider a mixture of SO2 and O2 kept at, room temperature. Compared to the oxygen, molecule, the SO2 molecule will hit the wall with, 1), 2), 3), 4), , greater mass., greater kinetic energy., greater average speed., smaller average speed., , 23) The ratio among most probable velocity, mean, velocity and root mean square velocity is given by, 2 : 8/ : 3, 1), 2 : 3 : 8/, 2), 1: 2 : 3, 3), 4) 1 : 2 : 3, o, 24) 1 C rise in temperature is equal to a rise of, o, 1) 33 F, , 2), 3), , 5 /9o F, 9 /5o F, , o, 4) 1 F, , 25) In the equation PV = nRT, which one cannot be, the numerical value of R?, 8.31 atm. K 1mol1, 1), 8.31 JK 1mol1, 2), 8.31  107 dyne cm K 1mol 1, 3), 8.31  107 erg K 1mol1, 4), 26) The ratio of most probable velocity to that of, average velocity is, 2/ , 1),  /2, 2), 2/, 3),  /2, 4), 27) If P, V, T represent pressure, volume and, temperature of the gas, the correct representation, of Boyle's law is, 1) PV  nRT, V  1/P, 2), (at constant T), 3) PV  RT, 4), , V, , 1, T (at constant P), , 28) If P, V, M, T and R are pressure, volume, molar, mass, temperature and gas constant respectively,, then for an ideal gas, the density is given by, , PHYSICS & CHEMISTRY BY KKMISHRA FOR NEET/JEE-MAIN/ADVANCED , @KKMISHRA CLASSESS, NAGPUR

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K.K.MISHRA CLASSES, , PM, 1) RT, M, 2) V, P, RT, 3), RT, 4) PM, 29) Pressure remaining the same, the volume of a, given mass of an ideal gas increases for every, degree centigrade rise in temperature by definite, fraction of its volume at, 1) absolute zero., o, 2) 0 C ., 3) its Boyle temperature., 4) its critical temperature., 30) Rate of diffusion of a gas is, 1) inversely proportional to the square root of its, molecular mass., 2) directly proportional to the square root of its, molecular mass., 3) directly proportional to its molecular mass., 4) directly proportional to its density., 31) What is the pressure of 2 mole of NH3 at, 27o C , when its volume is 5 litre in vander Waal's, equation (a = 4.17, b = 0.03711)?, 1) 9.2 atm, 2) 9.33 atm, 3) 9.74 atm, 4) 10.33 atm, 32) Which one of the following statements is wrong, for gases?, 1) Mass of the gas cannot be determined by, weighing a container in which it is enclosed., 2) Confined gas exerts uniform pressure on the, walls of its container in all directions., 3) Volume of the gas is equal to the volume of the, container confining the gas., 4) Gases do not have a definite shape and volume., 33) The densities of two gases are in the ratio of 1 :, 16. The ratio of their rates of diffusion is, 1) 1 : 4, 2) 1 : 16, 3) 4 : 1, 4) 16 : 1, , molecules because it is, 1) the most accurate form in which velocity can be, used in these calculations., 2) the square root of the average square velocity of, the molecules., 3) the most probable velocity of the molecules., 4) the average velocity of the molecules., 36) The density of neon will be highest at, 273o C, 2 atm, 1), 273o C,1 atm, 2), 0o C, 2 atm, 3), 4) S.T.P., 37) The density of air is 0.00130 g/ml. The vapour, density of air will be, 1) 14.56, 2) 14.4816, 3) 0.65, 4) 0.00065, 38) Which of the following exhibits the weakest, inter-molecular forces?, 1) H2O, 2) He, 3) HCl, 4) NH3, 39) Molecular velocities of the two gases at the, same temperature are u1 and u2 . Their masses, are m1 and m2 respectively. Which of the, following expressions is correct?, m1u12  m2u22, 1), m1 m2, , u1, u2, 2), m1u1  m2u2, 3), m1 m2,  2, u12, u2, 4), 40) The kinetic energy of 4 moles of nitrogen gas at, 1, 1, 127 0 C is how much cal?  R  2 cal mol K , 1) 3200, 2) 4400, 3) 4800, 4) 1524, , 34) Which one of the following indicates the value, of the gas constant R?, 1) 0.0821 lit K-1 mol-1, 2) 1.987 cal K-1 mol-1, 3) 8.3 cal K-1 mol-1, 4) 1.987 Joules K-1 mol-1, , 41) If the absolute temperature of an ideal gas, becomes double and pressure becomes half, the, volume of gas, 1) will be half., 2) will be four time., 3) will be double., 4) remains unchanged., , 35) In deriving the kinetic gas equation, use is, made of the root mean square velocity of the, , 42) "One gram molecule of a gas at N.T.P. occupies, 22.4 litres." This fact was derived from, , PHYSICS & CHEMISTRY BY KKMISHRA FOR NEET/JEE-MAIN/ADVANCED , @KKMISHRA CLASSESS, NAGPUR

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K.K.MISHRA CLASSES, 1), 2), 3), 4), , law of gaseous volume., Berzelius hypothesis., Avogadro's hypothesis., Dalton's theory., , 43) To which of the following gaseous mixtures is, Dalton's law not applicable?, 1) N2  H2  O2, 2) O2  N2  CO2, 3) NH3  HCl  HBr, 4) Ne  He  SO2, 44) The root mean square velocity of an ideal gas at, constant pressure varies density (d) as, 1/ d, 1), 2) d, , ascending it reaches a place where the temperature, o, is 23 C and pressure is 0.5 atm. The volume of, the balloon is, 1) 10000 litres, 2) 12000 litres, 3) 20000 litres, 4) 24000 litres, 50) The r. m. s. velocity of a certain gas is v at, 300 K. The temperature, at which the r. m. s., velocity becomes double, 1) 150 K, 2) 600 K, 3) 900 K, 4) 1200 K, , 3) d, 2, 4) d, 45) Choose the correct option: The Kelvin, temperature of an ideal gas is, 1) proportional to average kinetic energy of, molecules, 2) proportional to the average speed of the, molecules, 3) proportional to average potential energy of, molecules, 4) inversely proportion to partial pressure, 46) Ratio of average to most probable velocity is, 1) 1.0, 2) 1.112, 3) 1.128, 4) 1.224, 47), , N2, , is found in a litre flask under 100 kPa, O, pressure and 2 is found in another 3 litre flask, under 320 kPa pressure. If the two flasks are, connected, the resultant pressures is, 1) 210 kPa, 2) 265 kPa, 3) 310 kPa, 4) 420 kPa, 48) The root mean square velocity of an ideal gas in, a closed container of fixed volume is increased, 5  104 cm s1 to 10  104 cm s1 . Which of, from, the following statement correctly explains how the, change is accomplished?, 1) By heating the gas, the pressure is doubled., 2) By heating the gas, the temperature is, quadrupled., 3) By heating the gas, the pressure is quadrupled, (i.e. made four times)., 4) By heating the gas, the temperature is doubled., 49) A weather balloon filled with hydrogen at 1 atm, o, and 27 C has volume equal to 12000 litres. On, PHYSICS & CHEMISTRY BY KKMISHRA FOR NEET/JEE-MAIN/ADVANCED , @KKMISHRA CLASSESS, NAGPUR