JEE Main 2022 · 27 Jun · Shift 2 · Chemistry Q83

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ChemistryInteger+4 / -1Question 83 of 90

BeO reacts with HF in presence of ammonia to give [A] which on thermal decomposition produces [B] and ammonium fluoride. Oxidation state of Be in [A] is ______.

Your answer

Answer and worked solution

Official answer: 2

A. $\mathrm{BeO+2NH_3+4HF\rightarrow(NH_4)_2[BeF_4]+H_2O}$ ; on heating it gives $\mathrm{BeF_2}$ (B) and $\mathrm{NH_4F}$ .

Oxidation state of Be in $\mathrm{[BeF_4]^{2-}}$ : +2.

Answer: 2

Topics:Important compounds of s-block Oxidation number

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JEE Main 2022 · 27 Jun · Shift 2, Chemistry question 83