JEE Main · 2019 · Shift-IIeasyPB12-109

Chlorine on reaction with hot and concentrated sodium hydroxide gives.

p-Block Elements (Class 12) · Class 12 · JEE Main Previous Year Question

Question

Chlorine on reaction with hot and concentrated sodium hydroxide gives.

Options
  1. a

    Cl\mathrm{Cl^-} and ClO2\mathrm{ClO_2^-}

  2. b

    Cl\mathrm{Cl^-} and ClO3\mathrm{ClO_3^-}

  3. c

    Cl\mathrm{Cl^-} and ClO\mathrm{ClO^-}

  4. d

    ClO3\mathrm{ClO_3^-} and ClO2\mathrm{ClO_2^-}

Correct Answerb

Cl\mathrm{Cl^-} and ClO3\mathrm{ClO_3^-}

Detailed Solution

Reaction of Cl2\mathrm{Cl_2} with NaOH:

With cold dilute NaOH: Cl2+2NaOHcold,dilNaCl+NaOCl+H2O\mathrm{Cl_2 + 2NaOH \xrightarrow{cold,\,dil} NaCl + NaOCl + H_2O} Products: Cl\mathrm{Cl^-} and ClO\mathrm{ClO^-}

With hot concentrated NaOH: 3Cl2+6NaOHhot,conc5NaCl+NaClO3+3H2O\mathrm{3Cl_2 + 6NaOH \xrightarrow{hot,\,conc} 5NaCl + NaClO_3 + 3H_2O} Products: Cl\mathrm{Cl^-} and ClO3\mathrm{ClO_3^-}

Answer: Option (2) — Cl\mathrm{Cl^-} and ClO3\mathrm{ClO_3^-}

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