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JEE Advanced 2020Paper 1
Exam
JEE Advanced
Year
2020
Paper
Paper 1
Subject
Chemistry
Chapter
p Block Elements (Group 15, 16, 17 & 18)

JEE Advanced 2020 · Paper 1 · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

With respect to hypochlorite, chlorate and perchlorate ions, choose...

With respect to hypochlorite, chlorate and perchlorate ions, choose the correct statement(s).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 ClCl.
  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)( A ) since HOClHOCl is weakest oxyacid of chlorine. Therefore ClOClO - become strongest conjugate base.

(B)( B )

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

(C)( C ) 3ClO−⟶2Cl−+ClO3−Keq=10273{ClO}^{-} ⟶ 2{Cl}^{-} + {ClO}_{3}^{-}{K}_{eq} = {10}^{27}
In hot solution rate of disproportionation is fairly rapid.
4ClO3−⟶Cl−+3ClO4−Keq=10294{ClO}_{3}^{-} ⟶ {Cl}^{-} + 3{ClO}_{4}^{-}Keq = {10}^{29} It is thermodynamically possible but kinetically, it is very slow reaction.

(D)( D ) Lower oxyacids are good oxidizing agents.
SO32−+O¯Cl⟶SO42−+Cl−{SO}_{3}^{2 -} + \overset{¯}{O}Cl ⟶ {SO}_{4}^{2 -} + {Cl}^{-}

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