Paper: CSIR-NET June 2017 · Subject: Inorganic Chemistry · Chapter: Acids and Bases · Topic: Acid and Bases – General · Marks: 2 · Difficulty: Easy
The compound that gives a basic solution in HF is :
(a)$\mathrm{AsF_5}$
(b)$\mathrm{PF_5}$
(c)$\mathrm{BF_3}$
(d)$\mathrm{BrF}_{3}$
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
In HF a base is a species that increases [F⁻]/[HF₂⁻]. AsF₅, PF₅ and BF₃ accept F⁻ (acids); BrF₃ donates F⁻ (BrF₃ + HF → BrF₂⁺ + HF₂⁻), giving a basic solution (d).