11th class (FSc) chemistry Unit 3 MCQs
26. Plasma is conductor of electricity:
a. Good
b. Bad
c. None
d. Poor
27. The temperature of nature plasma us about:
a. 5000oC
b. 20000oC
c. 1000oC
d. 10000oC
28. Pressure remaining constant, at which temperature the volume of gas will become twice of what it is at 0o C:
a. 546 K
b. 546 oC
c. 273 K
d. 200 oC
29. Number of molecules in one dm of water is close to:
a. 18/22.4 ×1023
b. 6.02/22.4 ×1023
c. 55.5 x 6.02 x1023
d. 12.04/22.4 ×1023
30. Which of the following have the same number of molecules at STP?
a. 44 g of CO2 and 11.2dm3 of CO
b. 280 cm3 of CO2 and 280cm2 of N2O
c. 28 g of N2 and5.6 dm3 of oxygen
d. 11.2 dm3 of O2 and 32 g of O2
31. If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of gas will:
a. Reduce 1/4
b. Remain unchanged
c. Be doubled
d. Increase four times
32. How should the conditions be changed to prevent the volume of a given gas from expanding when its mass is increased?
a. Temperature and pressure both are lowered
b. Temperature is lowered and pressure is increased
c. Temperature and pressure both are increased
d. Temperature is increased and pressure is lowered
33. The molar volume of CO2 is maximum at:
a. 0 oC and 2 atm
b. STP
c. 273 oC and 2 atm
d. 127 oC and 1 atm
34. The order of the rate of diffusion of gases NH3,SO2, SO2, and CO2, is:
a. Cl2>SO2>CO2>NH
b. NH3>SO2>Cl2>CO2
c. NH3>CO2>Cl2>SO2
d. NH3>CO2>SO2>Cl2
35. Equal masses of methane ad oxygen are mixed in an empty container at 250
oC. The fraction of total pressure exerted by oxygen is:
a. 1/6
b. 1/3
c. 1/9
d. 8/9
36. Gases deviate from ideal behavior at high pressure. Which of the following is correct for non-ideality?
a. At high pressure, the volume of gas become insignificant
b. At high pressure, the gas molecules move in one direction only
c. At high pressure, the intermolecular attractions become significant
d. At high pressure, the collision between the gas molecules increased manifold
37. The deviation of a gas from ideal behavior is maximum at:
a. 100 oC and 2.0 atm
b. -10 oC and 5.0 atm
c. 0 oC and 2.0 atm
d. -10 oC and 2.0 atm
38. A real gas obeying van der walls equation will resemble the ideal gas if:
a. a is small 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
39. The number of molecules in 22.4 dm3 of H2 gas at 0o C and 1 atm are:
a. 6.02 x 1022
b. 60.2 x 1023
c. 6.02 x 1024
d. 6.02 x 1025
40. There are four gases H2,He,N2,and CO2 at 0 oC, which gas showsgreater non-ideal behavior?
a. CO2
b. He
c. N2
d. H2
41. At a given temperature and pressure, the one which shows marked deviation from ideal behavior is:
a. N3
b. H2
c. He
d. CO2
42. If the volume of a gas collected at a temperature of 600 oC and pressure of 1.05 x105 Nne3 is 60 dm3 what would be the volume ofgas at STP.
a. 75 cm3
b. 25 cm3
c. 51 cm3
d. 100 cm3
43. which graph represents Boyle’s law?
a. Graph
b. Graph
c. Graph
d. Graph
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