11th class (FSc) chemistry Unit 3 MCQs
Chapter 3 MCQs 11th Class Chemistry
Gases:
1. One torr is equal to:
a. 76 cm Hg
b. One pascal
c. One atmosphere
d. One mm of Hg
2. S.I unit of pressure is :
a. Nm2
b. Torr
c. Pound inch-2
d. mm Hg
3. The commonly used unit of pressure by meterorologists is:
a. Millibar
b. Atmosphere
c. Pound inch-2
d. Pascal
4. The S.I unit of pressure is expressed in:
a. Nm-3
b. Nm-1
c. mmHg
d. Nm-2
5. Mathematically Boyle’s law is showen as:
a. P/T=K
b. Pt=k
c. PV=k
d. Vt=k
6. The constant factor in Charles’s law is:
a. Pressure
b. Volume
c. Temperature
d. All of these
7. Absolute zero is equal to:
a. 00C
b. 2730C
c. 273k
d. -2730C
8. Pressure remaining constant, at which temperature the volume of agas will become twice of what it is at 00C
a. 5460C
b. 2560C
c. 273k
d. 2000C
9. If absolute temperature of a gas is doubled and pressure is reduced toone half, the volume of the gas will:
a. Increases four times
b. Remains unchanged
c. Be doubled
d. Reduce to 1/4
10. Which has same number of molecules at S.T.P?
a. 44 g of CO2 and 1dm3 of CO2
b. 11.0 dm3 of O2 and 32 g of O2
c. 280 mL of CO2 and 280cm3 of N2O
d. 28 g of N2 and 5.6 dm3 of O2
11. Equal mass of methane and oxygen are mixed in an empty container at 250C, The fraction of total pressure exerted by oxygen is:
a. 1/9
b. 1/3
c. 16/17
d. 8/9
12. Felling unconfortable breathing in un-pressurized cabins is due to:
a. Low pressure of O2
b. High pressure of CO2
c. Law pressure of CO2
d. Fatigue
13. The partial pressure of oxygen in air is:
a. 169 torr
b. 149 torr
c. 179 torr
d. 159 torr
14. Partial pressure of O2 in lungs is:
a. 116 torr
b. 760 torr
c. 159 torr
d. 320 torr
15. The spreading of fragrance of scent in air is due to:
a. Diffusion
b. Effusion
c. Density
d. Osmosis
16. Which gas will diffuse more rapidly?
a. NH3
b. CO2
c. SO2
d. HCl
17. Which gas will diffuse more rapidly among the following?
a. CO
b. N2
c. NH3
d. H2
18. The order of rate of diffusion of gases NH3,SO2Cl2 and CO2:
a. NH3>CO2>SO2>Cl2
b. NH3>SO2>Cl2>CO2
c. NH3>CO2>Cl2>SO2
d. Cl>SO2CO2>NH3
19. Which of the following will have highest rate of diffusion?
a. NH3
b. O2
c. SO2
d. CO2
20. …… gas have lowest rate of diffusion:
a. O2
b. He
c. N2
d. H2
21. Deviation of a gas from ideal behaviour is maximum at:
a. 400 C and 2atm
b. -10oC and 5atm
c. 0 C and 2 atm
d. -10C and 2atm
22. The gas show more deviation at:
a. High temperature and low pressure
b. Low temperature and low pressure
c. Low temperature and high pressure
d. High temperature and high pressure
23. If the value of a and b in van dar waals’s equation are close to zero for a gas, then the gas is:
a. Highly polor
b. Ideal
c. Liquefied easily
d. Non-ideal
24. A real gas obeying van-der waals equation will resemble ideal gas if:
a. a and b is large
b. Both a and b are large
c. a is large and b is small
d. Both a and b are small
25. Plasmas are found in everything from the sun is:
a. Electrons
b. Atoms
c. Quarks
d. Molecules