1. Which of the following gas elements exist in the liquid state at room temperature?
a) Hydrogen
b) Oxygen
c) Bromine
d) Iodine
Answer. c) Bromine;
At room temperature (approximately 20°C to 25°C or 68°F to 77°F), the gas that exists in the liquid state is Bromine.
2. Mustard gas is used
a) As fuel
b) In chemical warfare
c) As a source of mustard oil
d) As decolorization
Answer. b) In chemical warfare;
3. The methane gas-producing field is
a) Wheatfield
b) Paddy field
c) Cotton field
d) Groundnut field
Answer. b) Paddy field;
Methane gas is produced from various sources, including natural gas fields, coal mines, landfills, and agricultural activities, mainly in the Paddy field.
4. Methane is present in the atmosphere of
a) Sun
b) Mars
c) Jupiter
d) Both b and c
Answer. b) Mars
5. Consider the following statement and reason and select the correct answer with the help of the code given below:
Assertion ( A): Ozone kills microorganisms in water.
Reason ( R): Ozone is not radioactive
Code:
a) (A) and ( R) are both correct, and (R) is the correct explanation of ( A)
b) (A) and ( R) are both correct, and (R) is not the correct explanation of ( A)
c) (A) is true, but (R) is false
d) (A) is false, but (R) is true
Answer. b) (A) and ( R) are both correct, and (R) is not the correct explanation of ( A);
6. The technology used to obtain liquid oxygen or liquid hydrogen at an industrial level is called
a) Pyrotechnics
b) Pyrometry
c) Hydroponics
d) Cryogenics
Answer. d) Cryogenics;
7. The gases used in the breathing activity of divers are
a) Oxygen and Nitrogen
b) Oxygen and helium
c) Oxygen and Organ
d) Oxygen and Neon
Answer. b) Oxygen and helium;
8. Easily soluble in water
a) Carbon
b) Nitrogen
c) Ammonia
d) Iodine
Answer. c) Ammonia;
9. Which is used as Laughing Gas
a) Nitrous oxide
b) Nitrogen dioxide
c) Nitrogen trioxide
d) Nitrogen tetraoxide
Answer. a) Nitrous oxide;
"Laughing gas" is a common colloquial term for nitrous oxide (N2O), which is a colorless, sweet-smelling gas. It earned this nickname because inhaling nitrous oxide can cause euphoria and laughter in some individuals.
10. Which one of the following is not correct?
a) Bordeaux mixture is a mixture of copper sulfate and calcium Hydroxide in water and is used as a fungicide.
b) Boric acid is used in the pharmaceutical industry and also as a food preservative
c) Dry ice is solid carbon dioxide
d) Nitric oxide is a laughing gas
Answer. d) Nitric oxide is a laughing gas
11. Discharge of Nitrogen causes
a) Increase in the amount of atmospheric nitrogen
b) Increase in the amount of nitrogen in the lithosphere and in the atmosphere unchanged
c) The amount of nitrogen in the lithosphere and in the atmosphere is unchanged
d) Destructive of Nitrifying bacteria
Answer. c) The amount of nitrogen in the lithosphere and in the atmosphere is unchanged
12. The Gas used to inflate the Tyres of an aircraft is
a) Hydrogen
b) Nitrogen
c) Helium
d) Neon
Answer. b) Nitrogen
13. Helium is preferred to Hydrogen in air balloons because it
a) Is cheaper
b) Is less dense
c) Has greater lifting power
d) Does not form an explosive mixture with air
Answer. d) Does not form an explosive mixture with air;
14.
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