37.
The gas used in the manufacture of vanaspati from vegetable oil is
A. hydrogen B. oxygen
C. nitrogen D. carbon dioxide
Answer & Explanation
Answer: Option A
Explanation:
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38.
The ionic radii of N3-, O2-, F- and Na+ follows the order
A. N3- > O2- > F- > Na+
B. N3- > Na+ > O2- > F-
C. Na+ > O2- > N3- > F-
D. O2- > F- > Na+ > N3-
Answer & Explanation
Answer: Option A
Explanation:
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39.
The graphite rods in the nuclear reactor
A. react with U to release energy
B. produce neutrons
C. undergo combustion which triggers the nuclear fission
D. convert fast moving neutrons into thermal neutrons
Answer & Explanation
Answer: Option D
Explanation:
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40.
The first metal used by man was
A. iron B. copper
C. gold D. bronze
Answer & Explanation
Answer: Option B
Explanation:
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41.
The hydronium ion is
A. H+
B. HO –
C. H2+
D. H3O+
Answer & Explanation
Answer: Option D
Explanation:
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42.
The most electropositive elements among the following is
A. Na B. Ca
C. K D. Cs
Answer & Explanation
Answer: Option D
Explanation:
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