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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
Chemistrys Block ElementsJEE MainJEE Main 2022 (27 Jun Shift 2)
Solution:
1964 Upvotes Verified Answer
The correct answer is: 2
 BeO  on reaction with HF in the presence of ammonia,  NH42BeF4 is formed which on heating forms BeF2  along with ammonium fluoride. 

BeO+2NH3+4HFNH42BeF4+H2O

Compound A, is NH42BeF4

NH42BeF4heatBeF2+2NH4F

Compound B is BeF2

In NH42BeF4 the oxidation state of Be is +2.

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