## Grahm's Law MCQ Basic Level

Compared to other sections, Chemistry is considered to be the most scoring section. If prepared thoroughly, chemistry can help students to secure a meritorious position in the exam. These questions are very important in achieving your success in Exams after 12th.

Q1. Rate of diffusion of a gas is

•  Directly proportional to its density
•  Directly proportional to its molecular mass
•  Directly proportional to the square root of its molecular mass
•  Inversely proportional to the square root of its molecular mass

Inversely proportional to the square root of its molecular mass

Q2. The ratio of the rate of diffusion of a given element to that of helium is 1.4. The molecular weight of the element is

•  2
•  4
•  8
•  16

2

Q3. A gas diffuse 1/5 times as fast as hydrogen. Its molecular weight is

•  50
•  25
•  80
•  87

50

Q4. The molecular weight of a gas which diffuses through a porous plug at 1/6th of the speed of hydrogen under identical conditions is

•  27
•  72
•  36
•  48

72

Q5. Molecular weight of a gas that diffuses twice as rapidly as the gas with molecular weight 64 is

•  16
•  8
•  64
•  6.4

16

Q6. If rate of diffusion of A is 5 times that of B, what will be the density ratio of A and B

•  1/25
•  1/5
•  25
•  4

1/25

Q7. 50 ml of hydrogen diffuses out through a small hole from a vessel in 20 minutes. The time needed for 40 ml of oxygen to diffuse out is

•  12 min
•  64 min
•  8 min
•  32 min

64 min

Q8. The densities of two gases are in the ratio of 1 : 16. The ratio of their rates of diffusion is

•  16 : 1
•  4 : 1
•  1 : 4
•  1 : 16

4 : 1

Q9. Atmolysis is a process of

•  Atomising gas molecules
•  The breaking of atoms to sub-atomic particles
•  Separation of gases from their gaseous mixture
•  Changing of liquids to their vapour state

Separation of gases from their gaseous mixture

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