A metal which does not react with nitrogen is | vedclass

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(B) Only $K$ does not react with nitrogen directly,while others do.The reactions are:$6Li + N_2 \rightarrow 2Li_3N$$3Mg + N_2 \rightarrow Mg_3N_2$$3Ca

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$K$

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(B) Only $K$ does not react with nitrogen directly,while others do.The reactions are:$6Li + N_2 \rightarrow 2Li_3N$$3Mg + N_2 \rightarrow Mg_3N_2$$3Ca_{(s)} + N_{2(g)} \rightarrow Ca_3N_{2(s)}$Lithium is the smallest atom among alkali metals. When Lithium reacts with nitrogen gas $(N_2)$ at room temperature,it forms Lithium Nitride $(Li_3N)$,which is stable because the lattice energy released from the formation of $Li_3N$ is high enough to make the overall reaction exothermic.As $K$ is a group $1$ element,it does not react with $N_2$.

List-$I$ (Salt)	List-$II$ (Flame colour wavelength)
$(a)$ $LiCl$	$(i)$ $455.5 \text{ nm}$
$(b)$ $NaCl$	$(ii)$ $670.8 \text{ nm}$
$(c)$ $RbCl$	$(iii)$ $780.0 \text{ nm}$
$(d)$ $CsCl$	$(iv)$ $589.2 \text{ nm}$

$A$ metal which does not react with nitrogen is

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Match List-$I$ with List-$II$:

List-$I$ (Salt) List-$II$ (Flame colour wavelength)

$(a)$ $LiCl$ $(i)$ $455.5 \text{ nm}$

$(b)$ $NaCl$ $(ii)$ $670.8 \text{ nm}$

$(c)$ $RbCl$ $(iii)$ $780.0 \text{ nm}$

$(d)$ $CsCl$ $(iv)$ $589.2 \text{ nm}$

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