General Chemistry – Exercise – 1

16. Which of the following was to be discovered first in the chromospheres of the sun ?

(a) Krypton
(b) Xenon
(c) Neon
(d) Helium

Answer
Answer : (d)
Explanation
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17. Which of the following is in liquid form at room temperature?

(a) Lithium
(b) Sodium
(c) Francium
(d) Cerium

Answer
Answer : (c)
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18. Sodium metal is kept under :

(a) petrol
(b) alcohol
(c) water
(d) kerosene

Answer
Answer : (d)
Explanation
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19. Diamond is an allotropic form of :

(a) germanium
(b) carbon
(c) silicon
(d) sulphur

Answer
Answer : (b)
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20. In fireworks, the green flame is produced because of :

(a) sodium
(b) barium
(c) mercury
(d) potassium

Answer
Answer : (b)
Explanation
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