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JEE Advanced2020Chemistryp Block Elements (Group 15, 16, 17 & 18)Actual

With respect to hypochlorite, chlorate and perchlorate ions, choose the correct statement(s).

Options

  1. AThe hypochlorite ion is the strongest conjugate base.
  2. BThe molecular shape of only chlorate ion is influenced by the lone pair of electrons of Cl .
  3. CThe hypochlorite and chlorate ions disproportionate to give rise to identical set of ions.
  4. DThe hypochlorite ion oxidizes the sulfite ion.

Correct answer

A. The hypochlorite ion is the strongest conjugate base.

Step-by-step solution

( A ) since HOCl is weakest oxyacid of chlorine. Therefore ClO - become strongest conjugate base. ( B ) ( C ) 3 ClO - ⟶ 2 Cl - + ClO 3 - K eq = 10 27 In hot solution rate of disproportionation is fairly rapid. 4 ClO 3 - ⟶ Cl - + 3 ClO 4 - Keq = 10 29 It is thermodynamically possible but kinetically, it is very slow reaction. ( D ) Lower oxyacids are good oxidizing agents. SO 3 2 - + O ¯ Cl ⟶ SO 4 2 - + Cl -

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