73.
The maximum number of covalent formed by nitrogen is
A. 1 B. 2
C. 3 D. 4
Answer & Explanation
Answer: Option D
Explanation:
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74.
The formula C6H5-CO-CH3 represents
A. Acetone
B. Acetic acid
C. Acetophenone
D. Phenyl acetate
Answer & Explanation
Answer: Option C
Explanation:
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75.
The metal that is usually extracted from sea water is
A. Ca B. Na
C. K D. Mg
Answer & Explanation
Answer: Option D
Explanation:
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76.
The method of concentrating the ore which makes use of the difference in density between ore and impurities is called
A. liquation B. leaching
C. levigation D. magnetic separation
Answer & Explanation
Answer: Option C
Explanation:
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77.
The inert gases are ____ in water
A. sparingly soluble
B. insoluble
C. soluble
D. None of these
Answer & Explanation
Answer: Option A
Explanation:
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78.
The molecular formula of phosphorous is
A. P1 B. P2
C. P3 D. P4
Answer & Explanation
Answer: Option D
Explanation:
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