[1999]
(a) $\mathrm{Cu}$ powder
(b) $\mathrm{H}_2 \mathrm{O}$
(c) $\mathrm{H}_3 \mathrm{PO}_2$
(d) $\mathrm{C}_6 \mathrm{H}_5 \mathrm{OH}$
Correct Answer: 49.(b)
Solution: (b)
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