General Knowledge - Chemistry

Exercise :: Chemistry - Section 1

  • Chemistry - Section 1
37. 

The gas used in the manufacture of vanaspati from vegetable oil is

A. hydrogen
B. oxygen
C. nitrogen
D. carbon dioxide

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: 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: Option D

Explanation:

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40. 

The first metal used by man was

A. iron
B. copper
C. gold
D. bronze

Answer: Option B

Explanation:

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41. 

The hydronium ion is

A. H+
B. HO -
C. H2+
D. H3O+

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: Option D

Explanation:

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