The reaction of an element A with water produ | vedclass

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(A) The reaction of element $A$ with water is: $2 Na + 2 H_2O \rightarrow 2 NaOH + H_2 (g)$.Element $A$ is $Na$ (which imparts a golden yellow color t

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$Na, H_2, NaOH$ and $Zn$

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(A) The reaction of element $A$ with water is: $2 Na + 2 H_2O \rightarrow 2 NaOH + H_2 (g)$.Element $A$ is $Na$ (which imparts a golden yellow color to the Bunsen flame),gas $B$ is $H_2$,and solution $C$ is $NaOH$.When substance $D$ $(Zn)$ reacts with $NaOH$,it produces $H_2$ gas: $Zn + 2 NaOH + 2 H_2O \rightarrow Na_2[Zn(OH)_4] + H_2$.Also,$Zn$ reacts with dilute $H_2SO_4$ to produce $H_2$: $Zn + H_2SO_4 \rightarrow ZnSO_4 + H_2$.Thus,$A, B, C,$ and $D$ are $Na, H_2, NaOH,$ and $Zn$ respectively.Therefore,the correct option is $A$.

List-$I$ (Alloy)	List-$II$ (Use)
$A$. $Li-Pb$	$I$. In aircraft construction
$B$. $Be-Cu$	$II$. To make bearings for motor engines
$C$. $Mg-Al$	$III$. To make tetraethyl lead
$D$. $Na-Pb$	$IV$. To make high strength springs

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Match the following alloys in List-$I$ with their uses in List-$II$:
List-$I$ (Alloy) List-$II$ (Use)
$A$. $Li-Pb$ $I$. In aircraft construction
$B$. $Be-Cu$ $II$. To make bearings for motor engines
$C$. $Mg-Al$ $III$. To make tetraethyl lead
$D$. $Na-Pb$ $IV$. To make high strength springs

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