15. Which of the following reaction evolves heat?
(A) C+02 →CO,
(B) CH0+ 60, 600, + 6H,0
(C) CaO + H2OẠCa(OH)2
(D) All of these
16. In the decomposition of 2 molecules of lead (II) nitrate to given lead (11) oxide, nitrogen dioxide
and oxygen gas, the coefficient of nitrogen dioxide (in the balanced equation) is
(A) 1
(B) 2
(C) 3
(D) 4
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Answer:
15. [c]
16. [d]
Explanation:
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