A) \[Na,{{H}_{2}},NaOH,Zn\]
B) \[K,{{H}_{2}},KOH,Al\]
C) \[Ca,{{H}_{2}},Ca{{\left( OH \right)}_{2}},Sn\]
D) \[Ca{{C}_{2}},{{C}_{2}}{{H}_{2}},Ca{{(OH)}_{2}},Fe\]
Correct Answer: A
Solution :
[a] \[\underset{'A'}{\mathop{2Na}}\,+2{{H}_{2}}O~\to \underset{'C'}{\mathop{2NaOH}}\,+\underset{'B'}{\mathop{{{H}_{2}}}}\,\uparrow \] \[\underset{'D'}{\mathop{Zn}}\,+\underset{'C'}{\mathop{2NaOH}}\,\to N{{a}_{2}}Zn{{O}_{2}}+\underset{'B'}{\mathop{{{H}_{2}}}}\,\uparrow \] \[\underset{'D'}{\mathop{Zn}}\,+dil.{{H}_{2}}S{{O}_{4}}\to ZnS{{O}_{4}}+\underset{'B'}{\mathop{{{H}_{2}}}}\,\uparrow \] Na produces golden yellow colour with smokeless flame of Bunsen burner.
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