General Chemistry – 1 – 2

6. The hardest substance available on earth is :

(a) Gold
(b) Coal
(c) Diamond
(d) Platinum

ANSWER

EXPLANATION

7. Tetraethyl lead is used as :

(a) pain killer
(b) fire extinguisher
(c) mosquito repellent
(d) petrol additive

ANSWER

EXPLANATION

8. When an iron nail gets rusted, iron oxide is formed :

(a) without any change in the weight of the nail
(b) with decrease in the weight of the nail
(c) with increase in the weight of the nail
(d) without any change in colour or weight of the nail

ANSWER

EXPLANATION

9. Among the various allotropes of carbon :

(a) coke is the hardest, graphite is the softest
(b) diamond is the hardest, coke is the softest
(c) diamond is the hardest, graphite is the softest
(d) diamond is the hardest, lamp black is the softest

ANSWER

EXPLANATION

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

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

ANSWER

EXPLANATION


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