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(A) $1$. Substance $A$ gives a golden yellow flame in a Bunsen burner,which is a characteristic test for $Na$ (Sodium).$2$. $Na$ reacts with water to

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$Na$,$H_2$,$NaOH$ and $Zn$

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(A) $1$. Substance $A$ gives a golden yellow flame in a Bunsen burner,which is a characteristic test for $Na$ (Sodium).$2$. $Na$ reacts with water to produce hydrogen gas $(B = H_2)$ and sodium hydroxide $(C = NaOH)$: $2Na + 2H_2O \rightarrow 2NaOH + H_2$.$3$. Substance $D$ reacts with $NaOH$ solution to produce $H_2$ gas. Zinc $(Zn)$ is known to react with $NaOH$ to produce sodium zincate and hydrogen gas: $Zn + 2NaOH \rightarrow Na_2ZnO_2 + H_2$.$4$. $Zn$ also reacts with dilute $H_2SO_4$ at room temperature to produce $H_2$ gas: $Zn + H_2SO_4 \rightarrow ZnSO_4 + H_2$.$5$. Therefore,$A = Na$,$B = H_2$,$C = NaOH$,and $D = Zn$.

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