Question
With respect to hypochlorite, chlorate and perchlorate ions, choose the correct statement(s).
JEE Advanced
Chemistry
p Block Elements (Group 15, 16, 17 & 18)
2020
JEE Advanced 2020 (Paper 1)
JEE Advanced Chemistry Question (2020) — Solution
Options
- A. The hypochlorite ion is the strongest conjugate base.
- B. The molecular shape of only chlorate ion is influenced by the lone pair of electrons of Cl .
- C. The hypochlorite and chlorate ions disproportionate to give rise to identical set of ions.
- D. The hypochlorite ion oxidizes the sulfite ion.
Answer
D. The hypochlorite ion oxidizes the sulfite ion.
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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