Paper: CSIR-NET June 2016 · Subject: Inorganic Chemistry · Chapter: Acids and Bases · Topic: Acid and Bases – General · Marks: 2 · Difficulty: Medium
Under review — part of this question (a structure or an option) is not clear in the source scan. 4AB is checking it against the original book; the answer shown may change.
Among KF, SnF, and $\mathrm{SbF_4}$, solute(s) that increase(s) the concentration of $\mathrm{BrF_3^{-}}$ in $\mathrm{BrF_3}$, is/are
(a)KF only
(b)KF and $\mathrm{SnF_4}$
(c)$\mathrm{SnF_4}$ and $\mathrm{SbF_5}$
(d)KF, $\mathrm{SnF_4}$ and $\mathrm{SbF_5}$
Answer
Under review — not yet confirmed.
Answer: A
Explanation
In BrF₃ (2BrF₃ ⇌ BrF₂⁺ + BrF₄⁻) KF is a fluoride donor and raises [BrF₄⁻]; SnF₄ and SbF₅ are fluoride acceptors and raise [BrF₂⁺] — KF only (a).