• # question_answer Chemical [A] is used for softening of water to remove temporary hardness. [A] reacts with sodium carbonates to produce caustic soda. When$C{{O}_{2}}$is bubble through [A] it turns cloudy. Chemically [A] is A) $CaC{{O}_{3}}$                B) $Ca{{(HC{{O}_{3}})}_{2}}$C) $Ca{{(OH)}_{2}}$             D) $CaO$

Correct Answer: C

Solution :

$\underset{(A)}{\mathop{Ca{{(OH)}_{2}}}}\,+N{{a}_{2}}C{{O}_{3}}\to 2NaOH+CaC{{O}_{3}}$ On passing$C{{O}_{2}}$to calcium hydroxide solution. It turns milky due to the formation of $CaC{{O}_{3}}.$ $Ca{{(OH)}_{2}}+C{{O}_{2}}\to \underset{\text{Milky}}{\mathop{CaC{{O}_{3}}}}\,+{{H}_{2}}O$ Hence, the correct option is [c].

You need to login to perform this action.
You will be redirected in 3 sec