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General Chemistry – 1 – 4

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

EXPLANATION

17. Which of the following is in liquid form at room temperature?

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

ANSWER

EXPLANATION

18. Sodium metal is kept under :

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

ANSWER

EXPLANATION

19. Diamond is an allotropic form of :

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

ANSWER

EXPLANATION

20. In fireworks, the green flame is produced because of :

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

ANSWER

EXPLANATION


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