When electricity is passed through a common salt solution sodium hydroxide is produced along with the liberation of two gases $X$ and $Y$ . $X$ burns with a pop sound whereas $Y$ is used for disinfecting drinking water.
(i) Identify $X$ and $Y$
(ii) Give the chemical equation for the reaction stated above
(iii) State the reaction of $Y$ with dry slaked lime

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Solution

(i) $X : H_{2} Y : C l_{2}$ . $H_{2}$ burns with pop sound and $C l_{2}$ is used for disinfecting drinking water.
(ii) $2 N a C l + 2 H_{2} O ⟶ 2 N a O H + C l_{2} + H_{2}$
(iii) $C a (O H)_{2} + C l_{2} ⟶ C a O C l_{2} + H_{2} O$

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(i) X:H2Y:Cl2. H2 burns with pop sound and Cl2 is used for disinfecting drinking water.(ii) 2NaCl + 2H2O⟶2NaOH+Cl2+H2(iii) Ca(OH)2+Cl2⟶CaOCl2+H2O

(i) $X : H_{2} Y : C l_{2}$ . $H_{2}$ burns with pop sound and $C l_{2}$ is used for disinfecting drinking water.
(ii) $2 N a C l + 2 H_{2} O ⟶ 2 N a O H + C l_{2} + H_{2}$
(iii) $C a (O H)_{2} + C l_{2} ⟶ C a O C l_{2} + H_{2} O$