ABC26IN0008 · Acids and Bases

Subject: Inorganic Chemistry · Chapter: Acids and Bases · Topic: Acid and Bases – General · Exam: CSIR-NET JUNE 2016 · Marks: 2 · Difficulty: Medium

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

Answer (as printed): A

Explanation

$\mathrm{KF + BrF_3 \rightarrow K^{+} + BrF_4^{-}}$

$\mathrm{SnF_4 + 2BrF_3 \rightarrow 2[BF]^{+} + [SnF_6]^{2-}}$

$\mathrm{SbF_5 + BrF_3 \rightarrow BrF_2^{+} + [SbF_6]^{-}}$

This only KF increases the concentration of $\mathrm{BrF_4^{-}}$ in $\mathrm{BrF_3}$.