Question

Lime water reacts with chlorine to form:
(a)- $CaC{{l}_{2}}$
(b)- $CaOC{{l}_{2}}$
(c)- $Ca{{(Cl{{O}_{3}})}_{2}}$
(d)- $Ca{{O}_{2}}C{{l}_{2}}$

Answer 1

Lime water is a compound of calcium element in which calcium is the cation and hydroxyl is the anion. Chlorine is the element of group 17 and it is a halogen so, when it reacts with lime water then, there is the formation of calcium hypochlorite.

Complete answer:
Chemically lime water is a compound of calcium. Calcium hydroxide is a compound or salt in which calcium is the cation and hydroxyl is the anion and when calcium hydroxide is dissolved in water, we get lime water. Chlorine is the element of group 17 and period 3 of the periodic table, so it is a halogen. The formula of lime water can be written as $Ca{{(OH)}_{2}}$ and the formula of chlorine is written as $C{{l}_{2}}$. When they react with each other then there is the formation of calcium hypochlorite and water. As calcium hypochlorite is a compound in which there is calcium, oxygen, and chlorine, so its formula is $CaOC{{l}_{2}}$. The reaction of lime water and chlorine can be written as:
$Ca{{(OH)}_{2}}+C{{l}_{\,}}_{2}\to CaOC{{l}_{2}}+{{H}_{2}}O$
Calcium hypochlorite is an important compound as it is used as bleaching powder in water treatment. It is a white or grayish powder that is sparingly soluble in water but is soluble in alcohol. It is a very reactive compound as it is a strong oxidizing agent and the valency of calcium hypochlorite is +1.

Note:
The anhydrous form of calcium hypochlorite is safer to handle and it should be placed out of the reach of any acid, organic material, and metals. It is preferred that it must be stored in a cold and dry atmosphere.