On addition of conc. H_2SO_4 to a chloride sa | vedclass

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(C) When a chloride salt reacts with conc. $H_2SO_4$,it produces $HCl$ gas,which is colourless.$NaCl + H_2SO_4 \rightarrow NaHSO_4 + HCl$In the case o

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$HI$ gets oxidised to $I_2$

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(C) When a chloride salt reacts with conc. $H_2SO_4$,it produces $HCl$ gas,which is colourless.$NaCl + H_2SO_4 \rightarrow NaHSO_4 + HCl$In the case of an iodide salt,$HI$ is initially formed. Since $HI$ is a strong reducing agent,it reduces $H_2SO_4$ to $SO_2$ and itself gets oxidised to $I_2$ vapor,which is violet in colour.$2NaI + 2H_2SO_4 \rightarrow Na_2SO_4 + 2H_2O + SO_2 + I_2$Therefore,the violet fumes are due to the formation of $I_2$ gas.

On addition of conc. $H_2SO_4$ to a chloride salt,colourless fumes are evolved,but in the case of an iodide salt,violet fumes are observed. This is because:

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