The formula of soda ash is
(a) $N a_{2} C O_{3} .10 H_{2} O$ (b) $N a_{2} C O_{3} . 2 H_{2} O$
(c) $N a_{2} C O_{3} . H_{2} O$ (d) $N a_{2} C O_{3}$

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Solution

Answer: (d) $N a_{2} C O_{3}$

On heating washing soda, it loses its water of crystallisation, above 373 K, it becomes completely anhydrous white powder called soda ash.
$N a_{2} C O_{3} .10 H_{2} O W a s h i n g S o d a 373 K < - --- \to N a_{2} C O_{3} S o d a a s h + 10 H_{2} O$

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