In the laboratory, where you perform chemistry practical, you would have noticed $N a O H$ and $C a (O H)_{2}$ containing reagent bottles with a white coating inside. This coating is due to the formation of $N a_{2} C O_{3}$ and $C a C O_{3}$ .
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Solution

$2 N a O H + C O_{2} \to N a_{2} C O_{3} + H_{2} O$
$C a (O H)_{2} + C O_{2} \to C a C O_{3} + H_{3} O$
The reagent bottles containing white coating inside is due to their reaction with $C O_{2}$ to form corresponding carbonates.
Hence, the given statement is correct.

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