Eggshells are composed of which reacts with to produce a gas that turns limewater milky.

C a C O_{3}

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H C l

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C a (H C O_{3})_{2}

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N a C l

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Solution

The correct option is B $H C l$
Eggshells are composed of calcium carbonate $(C a C O_{3})$ . Metal carbonates react with acids to produce $C O_{2}$ gas that turns limewater, $C a (O H)_{2}$ , milky.
$C a C O_{3} (s) + 2 H C l (a q) \to$
$C a C l_{2} (a q) + H_{2} O (l) + C O_{2} (g)$

$C a (O H)_{2} (a q) + C O_{2} (g) \to$
$C a C O_{3} (↓) + H_{2} O (l)$

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