pBlock ElementsII 2 Question 7
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7. The products obtained when chlorine gas reacts with cold and dilute aqueous $\mathrm{NaOH}$ are
======= ####7. The products obtained when chlorine gas reacts with cold and dilute aqueous $\mathrm{NaOH}$ are
3e0f7ab6f6a50373c3f2dbda6ca2533482a77bed (a) $\mathrm{ClO}^{-}$and $\mathrm{ClO}_{3}^{-}$
(b) $\mathrm{ClO}{2}^{-}$and $\mathrm{ClO}{3}^{-}$
(c) $\mathrm{Cl}^{-}$and $\mathrm{ClO}^{-}$
(d) $\mathrm{Cl}^{-}$and $\mathrm{ClO}_{2}^{-}$
(2017 Main)
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Solution:
- $\mathrm{Cl}{2}, \mathrm{Br}{2}$ and $\mathrm{I}_{2}$ form a mixture of halide and hypohalites when react with cold dilute alkalies while a mixture of halides and haloate when react with concentrated cold alkalies.
$$ \underset{\text { Cold and dilute }}{\mathrm{Cl}{2}+2 \mathrm{NaOH}} \mathrm{NaCl}+\mathrm{NaClO}+\mathrm{H}{2} \mathrm{O} $$
$\therefore \mathrm{Cl}^{-}$and $\mathrm{ClO}^{-}$are obtained as products when chlorine gas reacts with cold and dilute aqueous $\mathrm{NaOH}$.
