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Chemical A is used for water softening to remove temporary hardness. A reacts with $N a_{2} C O_{3}$ to generate caustic soda. When $C O_{2}$ is bubbled through A, it turns cloudly. What is the chemical formula of A

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a

$C a O$

b

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

c

$C a C O_{3}$

d

$C a {(O H)}_{2}$

answer is C.

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Detailed Solution

$C a {(O H)}_{2} + N a_{2} C O_{3} \to 2 N a O H + C a C O_{3}$

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

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Chemical A is used for water softening to remove temporary hardness. A reacts with Na2CO3 to generate caustic soda. When CO2 is bubbled through A, it turns cloudly. What is the chemical formula of A