Q. Observe the following statements I. Bleaching powder is used in the preparation of chloroform. II. Bleaching powder decomposes in the presence of CoCl_{2} to liberate O_{2.} III. Aqueous KHF_{2} is used in the preparation of fluorine. The correct combination is
A) I,II and III are correct
B) Only II is correct
C) Only I and III are correct
D) Only I and II are correct
Explanation
(d)
Reaction s of ethyl alcohol with bleaching powder to form chloroform takes place as
CH_{3}CH_{2}OH+Cl_{2}⟶CH_{3} .CHO+2HCl
CH_{3}CHO+3Cl_{2}⟶CCl_{3} .CHO+3HCl
2CCl_{3} .CHO+Ca(OH)_{2}⟶2CHCl_{3}+(HCOO)_{2}Ca
Decomposition of bleaching powder is catalysed by cobalt chloride.
2CaOCl_{2}$\overset{CoCl_{2}}{\rightarrow}$2CaCl_{2}+O_{2}
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.