Reaction of BeO with ammonia and hydrogen flu | vedclass

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Question

(A) The reaction of beryllium oxide $(BeO)$ with ammonia $(NH_3)$ and hydrogen fluoride $(HF)$ is a standard method for the preparation of ammonium te

Vedclass · Accepted Answer

$(NH_4)_2BeF_4$

Vedclass · Answer

(A) The reaction of beryllium oxide $(BeO)$ with ammonia $(NH_3)$ and hydrogen fluoride $(HF)$ is a standard method for the preparation of ammonium tetrafluoroberyllate.The balanced chemical equation is: $BeO + 2 NH_3 + 4 HF \rightarrow (NH_4)_2BeF_4 + H_2O$.Upon thermal decomposition,$(NH_4)_2BeF_4$ breaks down into beryllium fluoride $(BeF_2)$ and ammonium fluoride $(NH_4F)$: $(NH_4)_2BeF_4 \xrightarrow{\Delta} BeF_2 + 2 NH_4F$.Therefore,'$A$' is $(NH_4)_2BeF_4$.

List-$I$	List-$II$
$a$. $Ca(OCl)_2$	$i$. Antacid
$b$. $CaSO_4 \cdot \frac{1}{2} H_2O$	$ii$. Cement
$c$. $CaO$	$iii$. Bleach
$d$. $CaCO_3$	$iv$. Plaster of Paris

Reaction of $BeO$ with ammonia and hydrogen fluoride gives '$A$' which on thermal decomposition gives $BeF_2$ and $NH_4F$. What is '$A$'?

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Match List-$I$ with List-$II$.

List-$I$ List-$II$

$a$. $Ca(OCl)_2$ $i$. Antacid

$b$. $CaSO_4 \cdot \frac{1}{2} H_2O$ $ii$. Cement

$c$. $CaO$ $iii$. Bleach

$d$. $CaCO_3$ $iv$. Plaster of Paris

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Which among the following elements is used in nuclear reactors as a moderator?

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