Question

Which of the following base is used in the manufacturing of bleaching powder
(A) Sodium hydroxide
(B) Calcium hydroxide
(C) Magnesium oxide
(D) Ammonium hydroxide

Answer 1

Hint : A compound is a base it means it gives $O{H^ - }$ ions according to classical concept. The colour of the bleaching powder is pale yellowish in appearance. Bleaching powder has a very specific strong odour like chlorine.

Complete Step By Step Answer:
Bleaching powder is soluble in water because it forms hydrogen bonds with water molecules but the solution of water and bleaching powder is not a clear solution because some impurities present in bleaching powder.
The molecular formula of bleaching powder is $CaOC{l_2}$ . Bleaching powder's chemical name is Calcium hypochlorite.
The preparation of bleaching powder occurs in many ways but the most common method to prepare bleaching powder is – by passing chlorine gas on dry calcium hydroxide $\left( {Ca{{(OH)}_2}} \right)$ . The calcium hydroxide is also known as slaked lime. The chemical reaction of preparing bleaching powder by calcium hydroxide-
$Ca{(OH)_2} + C{l_2} \to CaOC{l_2} + {H_2}O$
Hence option B is the correct option. Bleaching powder is formed by calcium hydroxide $\left( {Ca{{(OH)}_2}} \right)$ .

Additional Information:
Bleaching powder behaves as a base because it reacts with acid and forms salt.
Bleaching powder also known as calcium ox-chloride. $pH$ Of bleaching powder is 11. $pH$ May be defined as $- \log$ of the concentration of hydrogen ions.
The molecular mass of bleaching powder is $142.98g/mol$
It behaves as a strong oxidising agent so it is mainly used in industry as an oxidiser. It is mainly used in the textile industry because bleaching powder behaves as a cleaning agent so it is used to clean dirty clothes. And it is also used as a disinfectant.

Note :
The density of Bleaching powder is $2.35g/c{m^3}$
The melting point of Bleaching powder is ${100^O}C$
The boiling point of Bleaching powder is ${175^O}C$ .