IIT FOUNDATION
Test – 4 (IX std)
Name-_______________________________ Marks: 25m
I. CHOOSE THE CORRECT THE ANSWER: [16x1=16]
1) The total pressure of a mixture of two gases is equal to
(A) Sum of their partial pressures ` (C)The difference in partial pressures
(B) The product of partial pressure (D) The ratio of partial pressure
2) Dalton’s law of partial pressure is not applicable to
(A) H2 and N2 mixture (B) H2 and Cl2 mixture (C) H2 and CO2 mixture (D)none
3) Law of partial pressure was given by
(A) Graham (B) Gay Lussac (C) Dalton (D) Avogadro
4) The total pressure exerted by a number of non reacting gases is equal to the sum of partial pressures of the gases under the same conditions is known as
(A) Boyle’s law (B) Charles’ law (C) Dalton’s law (D) Avogadro law
5) A closed vessel contains equal number of nitrogen and oxygen molecules at pressure of P mm. If nitrogen is removed from the system then the pressure will be
(A) P (B) 2 P (C) P/2 (D) P2
6) A vessel has two equal compartments A and B containing H2 and O2 respectively, each at 1 atm pressure. If the wall separating the compartment is removed, the pressure
(A) Will remain unchanged in A and B (B) Will increase in A and B decrease in B
(C) Will decrease in A and increase in B (D) Will increase in both A and B
7) Two gases O2 and N2 having pressure P1 and P2 kept in two vessels of equal volumes at constant temperature are taken in a third vessel of the same volume and at the same temperature. The observed pressure P of the gas mixture is P= P1+P2. This relationship, is known as
(A) Boyle’s law (B) Charles’ law (C) Avogadro’s law (D) Dalton’s law
8) Assuming the solubility of O2 in water to be negligible, when 1 litre of dry oxygen is bubbled through water and collected at the same temperature and pressure in a bottle over water the volume of the gas collected would be
(A) less than 1litre (B) equal 1litre (C) more than 1litre (D) only a few cm3
9) A bottle of dry NH3 and another bottle of dry HCl are connected through a long tube are opened simultaneously at both ends, the white (NH4Cl)ring first formed will be
(A) At the center of the tube ` (B) Near the HCl bottle
(C) Near the ammonia bottle (D) Through out the length of the tube

10) Non reacting gases have a tendency to mix with each other. This property is known as
(A) Diffusion (B) Fusion (C) mixing (D) None
11) Which pair of the gaseous species diffuse through a small jet with the same rate of diffusion at same pressure and temperature?
(A) NO.CO (B) NO, CO2 (C) NH3, PH3 (D) NO, C2H6
12) At a given temperature and pressure the rate of diffusion of a gas is
(A) Directly proportional to the density of the gas
(B) Directly proportional to the square root of its density
(C) Inversely proportional to the density of the gas
(D) Inversely proportional to the square root of its density
13) The rate of diffusion of SO2, CO2, PCl3 and SO3 are in the following order
(A) PCl3> SO3> SO2> CO2 (B) CO2> SO2> PCl3> SO3
(C) SO2> SO3> PCl3> CO2 (D) CO2> SO2> SO3> PCl3
14) Graham’s law deals with the relation between
(A) Pressure and volume (B) Density and rate of diffusion
(C) Rate of diffusion and volume (D) Rate of diffusion and viscosity
15) The rate of diffusion of helium when compared to that of methane is
(A) twice (B) half (C) one fourth (D) 4 times
16) 16O and 18O can be separated by
(A) Spectroscopic method (B) Diffusion method
(C) Magnetic method (D) None of the above
II. ANSWER THE FOLLOWING [3x3=9]
17) Two gases A and B having the same volume diffuse through a porous partition in 20 and 10 seconds respectively. The molecular weight of A is 49. Calculate the molecular weight of B.
18) In 50 seconds, 300ml of oxygen diffuse through a porous pot: How long will 500ml of chlorine take to diffuse through the same pot under similar conditions? (The molecular weights of chlorine and oxygen being known i.e 71 and 32 respectively}
19) Find the volume of oxygen which takes 100sec to diffuse when 20ml of CO2 take 46.8 seconds to diffuse under similar conditions of temperature and pressure. Assuming the densities of O2 and O2 to be known.
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