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