The total number of elements among S,P,Zn,Al, | vedclass

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(A) Amphoteric elements like $Zn$,$Al$,$Sn$,and $Pb$ react with $NaOH$ to produce $H_2$ gas.$Zn + 2NaOH \rightarrow Na_2ZnO_2 + H_2$$2Al + 2NaOH + 6H_

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$4$

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(A) Amphoteric elements like $Zn$,$Al$,$Sn$,and $Pb$ react with $NaOH$ to produce $H_2$ gas.$Zn + 2NaOH \rightarrow Na_2ZnO_2 + H_2$$2Al + 2NaOH + 6H_2O \rightarrow 2Na[Al(OH)_4] + 3H_2$$Sn + 2NaOH + H_2O \rightarrow Na_2SnO_3 + 2H_2$$Pb + 2NaOH \rightarrow Na_2PbO_2 + H_2$$S$ and $P$ do not produce $H_2$ gas with $NaOH$.Therefore,the total number of such elements is $4$.

The total number of elements among $S$,$P$,$Zn$,$Al$,$Sn$,$Pb$ which produce $H_2$ gas with $NaOH$ is

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