Q29 · CSIR-NET Chemistry, June 2019
Paper: CSIR-NET June 2019 · Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Stability Chelate Effect · Marks: 2 · Difficulty: Medium
Consider the following reaction: \[ \mathrm{Hg}^{2+}(\mathrm{aq})+\mathrm{X}^{-}(\mathrm{aq})=[\mathrm{HgX}]^{+}(\mathrm{aq}) \]
The stability constants for $[\mathrm{HgX}]^{+}(\mathrm{aq})$ for $\mathrm{X}=\mathrm{F}, \mathrm{Cl}$ and Br follow the order (a)$\mathrm{F}<\mathrm{Cl}<\mathrm{Br}$
(b)$\mathrm{Br}<\mathrm{Cl}<\mathrm{F}$
(c)$\mathrm{Cl}<\mathrm{Br}<\mathrm{F}$
(d)$\mathrm{Br}<\mathrm{F}<\mathrm{Cl}$
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
Soft Hg²⁺ binds softer halides more strongly: F⁻ < Cl⁻ < Br⁻ (a).
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