set 2 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 2 EXERCISES
The following question based on inorganic chemistry topic of general science mcq
List-I (Compound) | List-II (Use) |
A. Cellulose nitrate | 1. Soft soap |
B. Potassium sulphate | 2. Gun powder |
C. Potassium salt of fatty acids | 3. Fertilizer |
D. Calcium oxide | 4. Glass |
(a) 4 1 2 3
(b) 3 2 1 4
(c) 2 3 1 4
(d) 3 1 2 4
The correct answers to the above question in:
Answer: (c)
These compounds are used in the manufacture of the following products.
Cellulose nitrate - Gun powder,
Potassium Sulphate - Fertiliser,
Potassium salts of fatty acids - Soft soap,
Calcium oxide - Glass.
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Read more inorganic chemistry Based General Science Questions and Answers
Question : 1
Approximately, how many different chemical elements exist in the Earth?
a) 300
b) 200
c) 250
d) 100
Answer »Answer: (d)
Question : 2
Assertion (A):
In the periodic table of chemical elements, electron affinity is always found to increase from top to bottom in a group.
Reason (R):
In a group, the atomic radii generally increase from top to bottom.
a) Both (A) and (R) are true and (R) is the correct explanation of (A)
b) (A) is true, but (R) is false
c) Both (A) and (R) are true, but (R) is not the correct explanation of (A)
d) (A) is false, but (R) is true
Answer »Answer: (d)
Question : 3
Which of the following is a fundamental element?
a) Sand
b) Marble
c) Diamond
d) Sugar
Answer »Answer: (c)
Question : 4
$H_2O$ is liquid and $H_2S$ is a gas because
a) atomic radius of oxygen is less than that of sulphur.
b) oxygen is less electronegative than sulphur.
c) oxygen forms stronger hydrogen bonding than sulphur.
d) atomic radius of oxygen is greater than that of sulphur.
Answer »Answer: (c)
H2O has an intermolecular hydrogen bond between its molecules (H—O—H------H—O—H) while H2S has weak van der Waal’s forces between its molecules.
Hence the molecules of H2O are more strongly packed than H2S, thus water is a liquid state at room temperature.
Question : 5
Which of the following statements about diamond are correct?
- It is used as a gem in jewellery because of its ability to reflect light.
- It is good conductor of electricity.
- It is used for cutting glass, marble stones and other hard materials.
- It is used for drilling of rocks.
a) 1, 2 and 3
b) 2, 3 and 4
c) 1, 3 and 4
d) 2 and 4
Answer »Answer: (c)
Diamond, an allotrope of carbon, has very high refractive because of which it is used as a gem in jewellery.
It is used for cutting glass, marble stones and other hard materials and for drilling rocks. It is a bad conductor of electricity. It is the hardest material known.
Question : 6
When iron is left exposed in open air, it gets rusted. Which constituent(s) of air is /are responsible for rusting iron?
- Oxygen gas present in air
- Moisture present in air
- Carbon dioxide gas present in air
a) 1 and 2
b) 2 only
c) 1 only
d) 2 and 3
Answer »Answer: (a)
Both oxygen and moisture present in air cause rusting of iron.
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