Chemistry MCQs Test 8

1. Ozone is present in?

  • (a) Mesosphere
  • (b) thermosphere
  • (b) Stratosphere
  • (d) troposphere
See Answer
(b) Stratosphere 

2. All are air pollution EXCEPT?

  • (a) Not
  • (b) N2
  • (c) SO2
  • (d) SO4
See Answer
(b) N2 

3. Which one of the following is responsible for global warming?

  • (a) Increase in concentration of N2
  • (b) Increase of concentration of CO2
  • (c) Increase of concentration of 02
  • (d) Increase of concentration of 03
See Answer
(b) Increase of concentration of CO2

4. Is the pH of acid rain less than?

  • (a) 13.6
  • (b) 10.6
  • (c) 7.6
  • (d) 5.6
See Answer
(d) 5.6

5. The coldest region in the atmosphere is?

  • (a) Troposphere
  • (b) stratosphere
  • (b) Mesosphere
  • (d) thermosphere
See Answer
(b) Mesosphere

6. Ozone is formed in the presence c4 ultraviolet radiations from?

  • (a) 0 and 0
  • (b) 02 and 0
  • (b) 02 and 02
  • (d) 02 and 03
See Answer
(b) 02 and 02

7. The gas(es) which is/are responsible for acid rain is/are?

  • (a) SO2
  • (b) NO2
  • (b) CO2
  • (d) all 502, NO2 and CO2
See Answer
(d) all 502, NO2 and CO2

8. based on temperature variation, the number of atmospheric regions is?

  • (a) Five
  • (b) two
  • (c) three
  • (d) five
See Answer
(d) five

9. The gas which protects the earth’s surface from ultraviolet radiation is?

  • (a) CO2
  • (b) N2
  • (c) O3
  • (d) O2
See Answer
(c) O3  

10. The lowest temperature in the troposphere is?

  • (a) 5C
  • (b) -5C
  • (c) 56C
  • (d) -56C
See Answer
(d) -56C

11. Under high pressure which of the following gas how show more ideality in characterA

  • A) N2
  • B) NH3
  • C) CO2
  • D) SO2
See Answer
A) N2

12. Which is incorrect about ideal gas

  • A) No force of attraction between molecules
  • B) NO example in nature
  • C) Can be liquefied easily
  • D) Obey gas laws at all condition of temperature and pressure
See Answer
C) Can be liquefied easily

13. Volume of a gas at STP is 10 dm3 at what temperature its volume will become 30dm3, keeping pressure constant

  • A) 3ᵒC
  • B) 819K
  • C) 819ᵒC
  • D) 3K
See Answer
B) 819K

14. Which of the following pairs o gases possess equal volume at STP

  • A) 44g CO2 and 44g CO
  • B) 16g O2 and 32gCH4
  • C) 3.01×1023 molecules of CO and 3.01 × 1023gram molecules of H2
  • D) 0.5 mole of NO and 16g O2
See Answer
D) 0.5 mole of NO and 16g O2

15. Absolute zero is

  • A) -273 K
  • B) -459.67ᵒF
  • C) 0ᵒC
  • D) -546 K
See Answer
B) -459.67ᵒF

16. A gas initially at 27ᵒC is heated up to 327ᵒC  , its average K.E will be

  • A) Doubled
  • B) 300 times
  • C) Four times
  • D) 327times
See Answer
A) Doubled

17. The correct value of general gas constant R is

  • A) 8.314 atm dm3 mol-1K-1
  • B) 62.4 torr cm3 mol-1K-1
  • C) 0.0821 jmol-1K-1
  • D) 8.314 × 107 erg mol-1K-1
See Answer
D) 8.314 × 107 erg mol-1K-1

18. Absolute temperature of a gas is directly proportional to average_________

  • A) Rotational K.E
  • B) Vibrational K.E
  • C) Translational K.E
  • D) All
See Answer
C) Translational K.E

19. An ideal gas can’t be liquefied because

  • A) Its critical temperature is always above 0ᵒC
  • B) It solidifies before becoming a liquid
  • C) Its molecules are smaller in size
  • D) Forces between its molecules are negligible
See Answer
D) Forces between its molecules are negligible

20. A fire extinguisher delivers 2.2 Kg of CO2. Volume of CO2 at STP is

  • A) 12dm3
  • B) 120d m3
  • C) 1120dm3
  • D) 2400dm3
See Answer
C) 1120dm3

21. When 200ml of gas at constant pressure is heated, its volume

  • A) Increases
  • B) Decreases
  • C) Remain unchanged
  • D) First increases then decreases
See Answer
A) Increases

22. The product of PV of a gas is unit of

  • A) Force
  • B) Work
  • C) Entropy
  • D) Enthalpy
See Answer
B) Work

23. Under what condition of temperature and pressure will a real gas behave most like an ideal gas?

  • A) Low temperature and low pressure
  • B) Low temperature and high pressure
  • C) Standard temperature and standard pressure
  • D) High temperature and low pressure
See Answer
D) High temperature and low pressure

24. Evaporation is designated as a cooling process because of the reason

  • A) it is a surface phenomenon
  • B) it involves heat absorption from its surrounding
  • C) High energy molecules leave behind the low energy molecules and cause cooling
  • D) All of the above
See Answer
D) All of the above

25. Vapour pressure of a liquid depends upon the following

  • A) Surface area temperature only
  • B) Volume of the liquid
  • C) Humidity of the liquid
  • D) Temperature and the inter-molecular force
See Answer
D) Temperature and the inter-molecular force
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