Answer:
The available information suggests
that the gas (X) is ammonia. The chemical reactions involved are as follows:
\[{{(N{{H}_{4}})}_{2}}C{{r}_{2}}{{O}_{7}}\xrightarrow{heat}\,\,C{{r}_{2}}{{O}_{3}}+{{N}_{2}}+4{{H}_{2}}O\]
\[3Mg\,+{{N}_{2}}\,\xrightarrow{\,\,}\,\,M{{g}_{3}}{{N}_{2}}\]
\[M{{g}_{3}}{{N}_{2}}+6{{H}_{2}}O\xrightarrow{\,}\,3Mg\,{{(OH)}_{2}}+\underset{\begin{smallmatrix}
\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\text{(X)} \\
\text{White}\,\text{fumes}\,\text{with}\,\text{HCl}
\end{smallmatrix}}{\mathop{2N{{H}_{3}}}}\,\]
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