21.
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
Answer: Option C
Explanation:
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22.
Galvanised iron sheets have a coating of
A. lead B. chromium
C. zinc D. tin
Answer & Explanation
Answer: Option C
Explanation:
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23.
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
Answer: Option C
Explanation:
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24.
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
Answer: Option A
Explanation:
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25.
Heavy water is
A. deuterium oxide
B. PH7
C. rain water
D. tritium oxide
Answer & Explanation
Answer: Option A
Explanation:
No answer description available for this question.
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