Question

When chlorine is passed through hot concentrated alkali solutions which one of the following is formed?

• A. [Tetraoxochloric (VII)]
• B. [Trioxochlorate (V)]
• C. Chloric (III) acid
• D. [Monooxochlorate (I)]

Answer 1

Answer: (B)

When $C{l}_2$ is passed through hot concentrated alkali solutions, a mixture of chloride and chlorate is formed.
$\stackrel{0}{3C{l}_2}+3NaOH$(excess) $\stackrel{\text{Hot}}{\to }\stackrel{-1}{5NaCl}$
$\stackrel{+5}{NaCl{O}_3}+3H_{2}O$
During these reactions, chlorine is simultaneously reduced to chloride ion $(C{l}^{-})$ and is oxidised to trioxochlorate $(V)$ ion $(Cl{O}_3^{-})$