$A$ compound $(A)$ is used in the preparation of washing soda to recover ammonia in the Solvay process. When $CO_2$ is bubbled through an aqueous solution of $(A)$,the solution turns milky. It is also used in whitewashing due to its disinfectant nature. What is the chemical formula of $(A)$?

  • A
    $Ca(HCO_3)_2$
  • B
    $CaO$
  • C
    $Ca(OH)_2$
  • D
    $CaCO_3$

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