____ dissolve in water reacts with ${C a C O}_{3}$ from rocks to form _______ .

{C O}_{2}

, calcium bicarbonate

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O_{2}

, calcium bicarbonate

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{C O}_{2}

, calcium carbonate

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O_{2}

, calcium carbonate

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Solution

The correct option is A ${C O}_{2}$ , calcium bicarbonate
Calcium is important for formation and strengthening of shells of snails and crabs. $C O_{2}$ dissolved in water reacts with $C a C O_{3}$ (limestone ) from rocks to form calcium bicarbonate. This is absorbed by the marine animals.
$C a C O_{3} + C O_{2} + H_{2} O \to C a (H C O_{3})_{2}$

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C O_{2}

C a C O_{3} + H_{2} O + C O_{2} \to C a (H C O_{3})_{2}

C a (O H)_{2} + C O_{2} \to C a C O_{3} + H_{2} O

C O_{2}

C a (O H)_{2} + C O_{2} \to C a C O_{3} + H_{2} O

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