General Knowledge - Chemistry

Exercise :: Chemistry - Section 1

  • Chemistry - Section 1
67. 

The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?

A. 1/6
B. 1/3
C. 1/8
D. 1/4

Answer: Option C

Explanation:

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68. 

The number of waves made by an electron moving in an orbit having maximum magnetic quantum number is +3

A. 4
B. 5
C. 2
D. zero

Answer: Option A

Explanation:

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69. 

The number of atoms present in 21.6 gram of silver (atomic weight = 108) are same as the molecules in

A. 1.8 gram of H2O
B. 12 moles of KMnO4
C. 0.6N H2SO4
D. 4.6 gram of C2H5OH

Answer: Option B

Explanation:

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70. 

The National Chemical Laboratory is situated in

A. New Delhi
B. Bangalore
C. Pune
D. Patna

Answer: Option C

Explanation:

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71. 

Equal masses of oxygen, hydrogen and methane are kept under identical conditions. The ratio of the volumes of gases will be

A. 2 : 16 : 2
B. 2 : 16 : 1
C. 1 : 16 : 2
D. 1 : 1 : 1

Answer: Option C

Explanation:

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72. 

The mass number of an atom is equal to

A. the number of protons
B. the number of protons and electrons
C. the number of nucleons
D. the number of neutrons

Answer: Option C

Explanation:

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