| Direction: A waxy crystalline solid [a] with garlic odour is obtained by burning a white solid [e] in the steam of air. [a] reacts vigorously with hot water forming a gas [b] and an acid [c]. Gas [b] has unpleasant odour of rotten fish and is neutral towards litmus. Wizen gas [b] is passed through a blue solution of a compound [f], it produces a black precipitate [d]. Compound [f] gives chocolate colored precipitate [g] with \[{{K}_{4}}[Fe{{(CN)}_{6}}]\]. |
A) \[FeS+HCl\]
B) \[C{{a}_{3}}{{P}_{2}}+{{H}_{2}}O\]
C) \[{{H}_{2}}S{{O}_{4}}+{{P}_{2}}{{O}_{5}}\]
D) \[M{{g}_{3}}{{B}_{2}}+HCl\]
Correct Answer: B
Solution :
Solutions (Q. Nos. 55-57) \[{{P}_{2}}+\frac{3}{2}{{O}_{2}}\xrightarrow{\,}\,\underset{\text{Waxy}\,\,\text{solid}\,\text{(A)}}{\mathop{{{P}_{2}}{{O}_{3}}}}\,\] \[\underset{(A)}{\mathop{2{{P}_{2}}{{O}_{3}}+6{{H}_{2}}O}}\,\xrightarrow{\,}\,\underset{(C)}{\mathop{3{{H}_{3}}P{{O}_{4}}}}\,+\underset{(B)}{\mathop{P{{H}_{3}}\uparrow }}\,\] \[\underset{(B)}{\mathop{2P{{H}_{3}}}}\,+\underset{(F)}{\mathop{3CuS{{O}_{4}}}}\,\xrightarrow{\,}\,\underset{Black\,(D)}{\mathop{P{{u}_{3}}{{P}_{2}}\uparrow +3{{H}_{2}}S{{O}_{4}}}}\,\] \[\underset{(F)}{\mathop{CuS{{O}_{4}}}}\,={{K}_{4}}[Fe{{(CN)}_{6}}]\,\xrightarrow{\,}\underset{\text{Chocolate}\,\text{ppt}\text{.}\,\,\text{(G)}}{\mathop{Cu{{[Fe{{(CN)}_{6}}]}_{2}}}}\,\] \[+2{{K}_{2}}S{{O}_{4}}\] \[P{{H}_{3}}\] can also be obtained as \[C{{a}_{3}}{{P}_{2}}+6{{H}_{2}}O\xrightarrow{\,}\,3Ca{{(OH)}_{2}}+2P{{H}_{3}}\]
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