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Question: Cl2 gas is obtained by various reactions but not by :...

Cl2 gas is obtained by various reactions but not by :

A

KMnO4(s)+concHCl→ΔKMnO_{4}(s) + concHCl\overset{\quad\Delta\quad}{\rightarrow}

B

KCl(s)+K2Cr2O7(s)+concH2SO4→ΔKCl(s) + K_{2}Cr_{2}O_{7}(s) + concH_{2}SO_{4}\overset{\quad\Delta\quad}{\rightarrow}

C

MnO2(s)+concHCl→ΔMnO_{2}(s) + concHCl\overset{\quad\Delta\quad}{\rightarrow}

D

KCl(s)+F2(l)→ΔKCl(s) + F_{2}(\mathcal{l})\overset{\quad\Delta\quad}{\rightarrow}

Answer

KCl(s)+K2Cr2O7(s)+concH2SO4→ΔKCl(s) + K_{2}Cr_{2}O_{7}(s) + concH_{2}SO_{4}\overset{\quad\Delta\quad}{\rightarrow}

Explanation

Solution

(1) 2MnO4– + 16H+ + 10Cl– ⟶\longrightarrow 2Mn2+ + 8H2O + 5Cl2

(2) Chromyl chloride test ; Cr2O72– + 4Cl– + 6H+ ⟶\longrightarrow 2CrO2Cl2 ­ (deep red) + 3H2O.

(3) MnO2 + 4HCl ⟶\longrightarrow MnCl2 + Cl2 + 2H2O

(4) 2Cl– + F2 ⟶\longrightarrow Cl2 + 2F–