In which of the following reactions is hydrog | vedclass

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(B) Let us analyze each reaction:$1$. Reaction of fused $NaOH$ with $C$: $2NaOH + C \rightarrow Na_2CO_3 + H_2$. Hydrogen is liberated.$2$. Reaction o

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Reaction of $NaOH$ with sulphur

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(B) Let us analyze each reaction:$1$. Reaction of fused $NaOH$ with $C$: $2NaOH + C \rightarrow Na_2CO_3 + H_2$. Hydrogen is liberated.$2$. Reaction of $NaOH$ with sulphur: $6NaOH + 3S \rightarrow 2Na_2S + Na_2SO_3 + 3H_2O$. No hydrogen gas is liberated.$3$. Heating concentrated $NaOH$ with $Si$: $Si + 2NaOH + H_2O \rightarrow Na_2SiO_3 + 2H_2$. Hydrogen is liberated.$4$. Reaction of zinc with $NaOH$: $Zn + 2NaOH \rightarrow Na_2ZnO_2 + H_2$. Hydrogen is liberated.Therefore, the correct option is $B$.

List-$I$ Elements	List-$II$ Colour imparted to the flame
$A$. $K$	$i$. Violet
$B$. $Ca$	$ii$. Brick Red
$C$. $Sr$	$iii$. Crimson Red
$D$. $Ba$	$iv$. Apple Green

In which of the following reactions is hydrogen gas not liberated?

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List-$I$ Elements List-$II$ Colour imparted to the flame
$A$. $K$ $i$. Violet
$B$. $Ca$ $ii$. Brick Red
$C$. $Sr$ $iii$. Crimson Red
$D$. $Ba$ $iv$. Apple Green
Choose the correct answer from the options given below:

Two elements $A$ and $B$ have similar chemical properties. They do not form solid hydrogencarbonates,but react with nitrogen to form nitrides. $A$ and $B,$ respectively,are :

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