Which of the following radicals does not libe | vedclass

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(C) $(a) \ S^{2-} + Zn + 2HCl \rightarrow ZnCl_2 + H_2S \uparrow$ (Gas liberated)$(b) \ SO_3^{2-} + Zn + 4HCl \rightarrow ZnCl_2 + H_2S \uparrow + H_2

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$NO_3^-$

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(C) $(a) \ S^{2-} + Zn + 2HCl \rightarrow ZnCl_2 + H_2S \uparrow$ (Gas liberated)$(b) \ SO_3^{2-} + Zn + 4HCl \rightarrow ZnCl_2 + H_2S \uparrow + H_2O$ (Gas liberated)$(c) \ NO_3^- + 4Zn + 10HCl \rightarrow 4ZnCl_2 + NH_4Cl + 3H_2O$ (No gas liberated,$NH_4Cl$ is a solid salt)$(d) \ CH_3COO^- + Zn + 2HCl \rightarrow ZnCl_2 + CH_3COOH$ (Acetic acid is liquid at room temperature,no gas liberated)Note: The question asks for the radical that does not liberate gas. Both $(c)$ and $(d)$ do not liberate gas. However,in the context of standard qualitative analysis,$NO_3^-$ is the classic example of a radical that undergoes reduction to $NH_4^+$ in the presence of $Zn/HCl$ without gas evolution.

Which of the following radicals does not liberate gas with ($Zn$ + dil. $HCl$) on warming?

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