A) \[Na,\,{{H}_{2}},\,NaOH,\,Zn\]
B) \[K,\,{{H}_{2}},\,KOH,\,Al\]
C) \[Ca{{H}_{2}},\,Ca{{(OH)}_{2}},\,Sn\]
D) \[Ca{{C}_{2}},\,{{C}_{2}}{{H}_{2}},\,Ca{{(OH)}_{2}},\,Fe\]
Correct Answer: A
Solution :
Only Na gives golden colour to bunsen flame. So, A is Na. \[\underset{'A'}{\mathop{2Na}}\,+2{{H}_{2}}O\xrightarrow[{}]{{}}\underset{'C'}{\mathop{2NaOH}}\,+\underset{'B'}{\mathop{{{H}_{2}}}}\,\uparrow \] \[\underset{'D'}{\mathop{Zn}}\,+\underset{'C'}{\mathop{2NaOH}}\,\xrightarrow[{}]{{}}N{{a}_{2}}Zn{{O}_{2}}+\underset{'B'}{\mathop{{{H}_{2}}}}\,\uparrow \] \[\underset{'D'}{\mathop{Zn}}\,+dil.\,\,{{H}_{2}}S{{O}_{4}}\xrightarrow[{}]{{}}ZnS{{O}_{4}}+\underset{'B'}{\mathop{{{H}_{2}}}}\,\uparrow \] Na, produces golden yellow colour with smokeless flame of bunsen burner.You need to login to perform this action.
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