Tiêu đề 05. STATES OF MATTER.pdf ✅

PAPER 1 (1.) For a given mass of a gas, if pressure is reduced to half and temperature is increased two times, then the volume would become : (1) V / 4 (2) 2 2 V (3) 6 V (4) 4 V (2.) Kinetic energy of a gas depends upon its : (1) Molecular mass (2) Atomic mass (3) Equivalent mass (4) None of these (3.) Which curve does not represent Boyle's law : (1) (2) (3) (4) (4.) A gas can be liquified : (1) Above its critical temperature (2) At its critical temperature (3) Below its critical temperature (4) At any temperature (5.) Kinetic energy of one mole of gas is calculated by the formula : (1) 1 KE RT 2 = (2) 3 2 KE RT = (3) 5 KE RT 2 = (4) None (6.) Which of the following relationship is correct, where r is the rate of diffusion of a gas and d is its density : (1) r d  1/ (2) r d  (3) r d = (4) r d  (7.) Which of the following is true for the significance of Vander Waal's constant a & b respectively : (1) Attractive forces and bond energy of molecule (2) Shape and volume of the molecules (3) Volume and repulsive force of molecules (4) Attractive force and volume of the molecules (8.) Equal masses of ethane and hydrogen are mixed in an empty container at 25 C . The fraction of the total pressure exerted by hydrogen is : (1) 1/1 (2) 15/16 (3) 1/16 (4) 18/ 25
(9.) The ratio between the root mean square velocity of H2 at 50 K and that of O2 at 800 K is : (1) 4: 4 (2) 4:3 (3) 1: 2 (4) 1:3 (10.) An ideal gas will have maximum density at : (1) 0.5 atm and 600 K (2) 2.0 atm and 150 K (3) 1.0 atm and 300 K (4) 0.5 atm and 500 K (11.) Gas A can be liquefied at room temperature by applying pressure but gas B cannot . This reflects (1) Critical temperature of B is less than A (2) Critical temperature of B is greater than A (3) Critical temperature of both A and B are greater than room temperature (4) Critical temperature f both are equal (12.) An open vessel at 27 C is heated until 3/ 5 part of the air in it has been expelled. Assuming that the volume of the vessel remains constant, Find the temperature to which the vessel has been heated. (1) 377 C (2) 577 C (3) 277 C (4) 477 C (13.) The temperature at which root mean square velocity of SO2 gas is double the root mean square velocity of O2 gas at 27 C . is : (1) 300 C (2) 2127 C (3) 2271 C (4) 600 C (14.) The ratio of average velocity and most probable velocity is : (1) 2  (2) 2  (3) 2  (4) 2  (15.) The partial pressure of hydrogen in a flask containing 2 g of H2 and 32 g of SO2 is : (1) 1/16 of total pressure (2) 1/ 2 of total pressure (3) 2 / 3 of total pressure (4) 1/8 of total pressure (16.) The values of vander Waal's constant 'a' for the gases O , N , NH 2 2 3 and CH4 are 1.360, 1.390, 4.170 and 2 2.253 L atm mol− respectively. The gas which can most easily bliquefied is : (1) O2 (2) N2 (3) NH3 (4) CH4 (17.) The compressibility of a gas is less than unity at STP therefore : (1) 22.4 Vm  litres (2) V 22.4 m  litres (3) V 22.4 m = litres (4) V 44.8 m = litres
(18.) 2g of hydrogen diffuses from a container in 10 minute. How many gram of oxygen would diffuse through the same container in the same time under similar conditions : (1) 5 g (2) 4 g (3) 6 g (4) 8 g (19.) Boyle's law is applicable in : (1) isobaric process (2) isochoric process (3) isothermal process (4) adiabatic process (20.) If the density of a gas A is 1.5 times that of B then the molecular mass of A is M . The molecular mass of B will be- (1) 1.5M (2) M /1.5 (3) 3M (4) M /3 (21.) A gas 'A' having molecular weight 4 diffuses thrice as fast as the gas B . The molecular weight of gas B is- (1) 36 (2) 12 (3) 18 (4) 24 (22.) The rate of diffusion of methane at a given temperature is twice that of a gas X . The molecular weight of X is - (1) 64 (2) 32 (3) 4 (4) 8 (23.) In which of the following pairs the gaseous species diffuse through a porous plug with the same rate of diffusion - (1) NO, CO (2) NO,CO2 (3) NH ,PH 3 3 (4) NO,C H2 6 (24.) Which of the following expression does not give root mean square velocity- (1) 1 3RT 2 M       (2) 1 3P 2 DM       (3) 1 3P 2 D       (4) 1 3PV 2 M       (25.) The term that accounts for intermolecular force in vander Waal's equation for non ideal gas is- (1) RT (2) V b − (3) ( ) 2 P a V + / (4) 1 [RT]− (26.) The Van der Waal's parameters for gases W X, , Y and Z are - Gas ( ) 2 2 a atm L mol− ( ) 1 b Lmol− W 4.0 0.027 X 8.0 0.030 Y 6.0 0.032
Z 12.0 0.027 Which one of these gases has the highest critical temperature? (1) W (2) X (3) Y (4) Z (27.) The units of the Van der Waal's constant 'a' are - (1) atm 2 2 L mol− (2) 2 2 atm L mol − − (3) atm 1 Lmol− (4) atm 2 molL− (28.) If the Vander Waal's constants of gas A are given as - a ( ) 2 2 atmL mol 6.5 = b (L mol ) 1 0.056 − than ciritical pressure of A is (1) 56.24 atm (2) 76.77 atm (3) 42.44 atm (4) 36.42 atm (29.) The velocity possessed by most of the gaseous molecules is - (1) Average velocity (2) Most probable velocity (3) R.M.S. velocity (4) None of these. (30.) The vapour densities of CH4 and O2 are in the ratio 1: 2 . The ratio of rates of diffusions of O2 and CH4 at same P and T is - (1) 1: 2 (2) 2 :1 (3) 1:1.41 (4) 1: 4.14 (31.) Four particles have speed 2,3, 4 and 5 cm/ s respectively. Their rms speed is - (1) 3.5 cm/ s (2) (27 / 2 cm / s ) (3) 54 cm / s (4) ( 54 / 2 cm / s ) (32.) The density of carbon monoxide at STP is - (1) 1 0.625 g L− (2) 1 1.25 g L− (3) 1 2.5 g L− (4) 1 1.875 g L− (33.) Which of the following expressions of compression factor Z (= pV / RT m ) of a real gas is applicable at low pressure - (1) 1 / Z a V RT = − m (2) Z 1 a / V RT = + m (3) Z = +1 pb / RT (4) Z = −1 pb / RT (34.) A gas with formula C Hn n2 2+ diffuses through the porous plug at a rate one sixth of the rate of diffusion of hydrogen gas under similar conditions. The formula of gas is - (1) C H2 6 (2) C H10 22 (3) C H5 12 (4) C H6 14