Gases MCQs 1

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A test from chapter 3 i.e Gases of Chemistry part 1. This is Free online test for FSc and Entry test Preparation for UET, NUST, FAST, GIKI, PIEAS, NFC, Punjab University, UHS, other Engineering Universities and Medical Colleges.

1. Weight of one dm3 of O2 at STP is

A) 1.4384 gm
B) 1.4394 gm
C) 1.6384 gm
D) 1.3384 gm

2. Density of gas is usually expressed as

A) kg/m^3
B) kg/dm^3
C) g/dm^3
D) g/cm^3

3. Kinetic equation is equal to

A) P V = n R T
B) P V = R T
C) PV = m n c^2
D) PV = m n c^2

4. All gases solidify before reaching at

A) 373 oK
B) 273 oC
C) – 473 oC
D) 0 K

5. One mole of any gas at STP occupies volume

A) 2.24 dm3
B) 22.4 dm3
C) 44.4 dm3
D) 48.4 dm3

6. Deep sea divers breath mixture of nitrogen and oxygen in a ratio of:

A) 96% N2 and 4% O2
B) 4% and N2 and 96% O2
C) 80% N2 and 20% O2
D) 20% N2 and 80% O2

7. A real gas obeying Vander Waal’s equation will resemble ideal gas if:

A) both ‘a’ and ‘b’ are large
B) both ‘a’ and ‘b’ are small
C) ‘a’ is small and ‘b’ is large
D) ‘a’ is large and ‘b’ is small

8. An ideal gas obeys

A) Boyle’s law
B) Charle’s law
C) Avogadro’s law
D) all above

9. The value of compressibility factor for an ideal gas is equal to:

A) 1
B) 1.5
C) 2
D) 2.5

10. Gases are ideal at

A) low pressure and high temperature
B) low temperature and high pressure
C) high pressure and high temperature
D) low pressure and low temperature