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
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
The correct answers to the above question in:
Answer: (d)
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Read more inorganic chemistry Based General Science Questions and Answers
Question : 1
Which of the following is a fundamental element?
a) Sand
b) Marble
c) Diamond
d) Sugar
Answer »Answer: (c)
Question : 2
Consider the following statements :
- Solid NaCl conducts electricity.
- Bauxite is purified by chemical separation.
- Copper is purified by electrolytic refining.
a) 2 and 3
b) 1 and 3
c) 1 and 2
d) 1, 2 and 3
Answer »Answer: (a)
Solid NaCl cannot conduct electricity as it does not have free ions for electrolytic conductance.
Question : 3
Approximately, how many different chemical elements exist in the Earth?
a) 300
b) 200
c) 250
d) 100
Answer »Answer: (d)
Question : 4
Match List-I with List-II :
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
Answer »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.
Question : 5
$H_2O$ 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.
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