Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. When \[C{{O}_{2}}\] is bubbled through a solution of A, it turns cloudy. What is the chemical formula of A [Pb. CET 1990; AIIMS 1999]

Chemical A is used for water softening to remove temporary hardness. A

1.	Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. When \[C{{O}_{2}}\] is bubbled through a solution of A, it turns cloudy. What is the chemical formula of A [Pb. CET 1990; AIIMS 1999]
A.	\[CaC{{O}_{3}}\]
B.	CaO
C.	\[Ca{{(OH)}_{2}}\]
D.	\[Ca{{(HC{{O}_{3}})}_{2}}\]
Answer» D. \[Ca{{(HC{{O}_{3}})}_{2}}\]

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Chemical A is used for water softening to remove temporary hardness. A reacts with sodium carbonate to generate caustic soda. When \[C{{O}_{2}}\] is bubbled through a solution of A, it turns cloudy. What is the chemical formula of A [Pb. CET 1990; AIIMS 1999]

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