Title DPP-8 SOLUTION.pdf ✅

CLASS : XIth SUBJECT : CHEMISTRY DATE : DPP No. : 8 1 (c) Ideal gas cannot be liquefied as its molecules have no force of attractions. 2 (c) uAV = [8RT/πM] 1/2 4 (a) V ∝ T P 5 (d) rH2 rO2 = MO2 MH2 50/20 40/t = 32 2 ( ∵ r = V t ) t 16 = 4 ⇒t = 64 min 7 (a) Rate of diffusion of hydrogen is more than methane thus the balloon will have enlarged 8 (c) Kinetic energy depends on temperature only. 9 (a) For H2 and He,PV > nRT;Also Z = PV nRT 10 (a) The number of spheres in one body centred cubic and in one face centred cubic unit cell is 2 and 4 respectively 11 (b) PV = constant at constant temperature. 12 (c) uH2 uO2 = [ MO2 MH2 ] if T is constant. Topic :- STATES OF MATTER Solutions
13 (b) Total mole = 4.4 44 + 2.24 22.4 = 1 5 ;molecules = N 5 14 (d) n = pV RT = 3170 × 10―3 8.314 × 300 = 1.27 × 10―3 mol 15 (b) Most probable velocity = 8RT πM T = (27 + 273) = 300 K Molecular mass of H2 = 2 g mol ―1 Most probable velocity (H2 ) = 8 × 8.314 × 107 × 300 3.14 × 2 = 17.8 × 104 cm/s 16 (d) urms = 2 2 + 3 2 + 4 2 + 5 2 4 = 54 2 cm/s 17 (b) On heating the gas in open vessel At 300 K :P1V1 = n1 ∙ R ∙ 300 At 400 K :P1V1 = n2 ∙ R ∙ 400 ∴ n1 n2 = 4 3 or n2 = 3 4 n1 Thus, n1 4 gas is given out 18 (b) A fact at zero Kelvin. 20 (b) V1/V2 = T1/T2
ANSWER-KEY Q. 1 2 3 4 5 6 7 8 9 10 A. C C A A D C A C A A Q. 11 12 13 14 15 16 17 18 19 20 A. B C B D B D B B D B