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General Chemistry – 1 – 2

6. The hardest substance available on earth is :

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

Answer
Answer : (c)

Explanation
No answer description available for this question. Let us discuss.

7. Tetraethyl lead is used as :

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

Answer
Answer : (d)

Explanation
No answer description available for this question. Let us discuss.

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
Answer : (c)

Explanation
No answer description available for this question. Let us discuss.

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
Answer : (c)

Explanation
No answer description available for this question. Let us discuss.

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
Answer : (a)

Explanation
No answer description available for this question. Let us discuss.


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