Pblock Elementsii Result Question 7
7. The products obtained when chlorine gas reacts with cold and dilute aqueous $\mathrm{NaOH}$ are
(2017 Main)
(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 $\mathrm{ClO}_2^{-}$
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Answer:
Correct Answer: 7. ( c )
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.
$\mathrm{Cl}_2+ \underset{\text{Cold and dilute}}{2 \mathrm{NaOH}} \longrightarrow \mathrm{NaCl}+\mathrm{NaClO}+\mathrm{H}_2 \mathrm{O}$
$\therefore \mathrm{Cl}^{-}$and $\mathrm{ClO}^{-}$are obtained as products when chlorine gas reacts with cold and dilute aqueous NaOH .
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