Dihydrogen can be prepared by which of the fo | vedclass

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(C) $I$. $Zn + 2HCl \ (dil.) \longrightarrow ZnCl_2 + H_2 \uparrow$$II$. $Zn + 2NaOH \ (aq.) \longrightarrow Na_2ZnO_2 + H_2 \uparrow$$III$. Heating c

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$(I)$ and $(II)$

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(C) $I$. $Zn + 2HCl \ (dil.) \longrightarrow ZnCl_2 + H_2 \uparrow$$II$. $Zn + 2NaOH \ (aq.) \longrightarrow Na_2ZnO_2 + H_2 \uparrow$$III$. Heating calcium hydrogen carbonate $\left[Ca(HCO_3)_2\right]$ results in:$Ca(HCO_3)_2 \stackrel{\Delta}{\longrightarrow} CaCO_3 + CO_2 + H_2O$Since reaction $(III)$ does not produce $H_2$,only reactions $(I)$ and $(II)$ produce dihydrogen.

Dihydrogen can be prepared by which of the following reactions?
$(I)$ Reaction of granulated $Zn$ with dil. $HCl$
$(II)$ Reaction of $Zn$ with aq. $NaOH$
$(III)$ By heating calcium hydrogen carbonate

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Dihydrogen can be prepared by which of the following reactions?$(I)$ Reaction of granulated $Zn$ with dil. $HCl$$(II)$ Reaction of $Zn$ with aq. $NaOH$$(III)$ By heating calcium hydrogen carbonate