In which of the following reaction, the underlined substance has been reduced?

Question

Smart Achievers · Accepted Answer

(3)

1) $\overset{+ 2}{CO} \to \overset{+ 4}{{CO}_{2}}$

2) $\overset{+ 2}{CuO} \to \overset{+ 2}{{CuCl}_{2}}$

3) $\overset{+ 1}{H_{2} O} \to \overset{0}{H_{2}}$

4) $\overset{0}{C} \to \overset{+ 4}{{CO}_{2}}$

Only in (3), O.N. of hydrogen decreases from +1 to 0 and hence $H_{2} O$ gets reduced to $H_{2}$ .

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