General Science – Exercise – 2

66. In fireworks, the green flame is produced because of

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

67. The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of

(a) bromine
(b) fluorine
(c) chlorine
(d) sulphur

68. Amalgams are

(a) highly coloured alloys
(b) alloys which contain mercury as one of the contents
(c) alloys which have great resistance to abrasion
(d) alloys which contain carbon

69. The property of a substance to absorb moisture from the air on exposure is called

(a) osmosis
(b) deliquescence
(c) efflorescence
(d) desiccation

70. The group of metals Fe, Co, Ni may best called as

(a) transition metals
(b) main group metals
(c) alkali metals
(d) rare metals

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