Question

Which of the following reactions shows reduction of water?

• A. $2H_{2}O + 2Na \rightarrow 2NaOH + H_{2}$
• B. $6CO_{2} + 12H_{2}O \rightarrow C_{6}H_{12} + O_{2}$
• C. $2F_{2} + 2H_{2}O \rightarrow 4H^{+} + 4F^{-} + O_{2}$
• D. $P_{4}O_{10} + 6H_{2}O \rightarrow 4H_{3}PO_{4}$

Answer 1

Answer: (A)

$2H_{2}O + 2Na \rightarrow 2NaOH + H_{2}$

Answer 2

: Water is reduced to dihydrogen by highly electropositive metals. In this reaction $H_{2}O$is reduced to $H_{2}$. In other two reactions. $H_{2}O$is oxidised to $O_{2}$and $P_{4}O_{10}$is hydrolysed by water.