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a
Chlorine water on long standing loses its yellow colour due to the formation of HCl and HOCl
b
The composition of bleaching power is Ca(OCl)2.CaCl2.Ca(OH)2.2H2O
c
The bleaching action of chlorine water is due to reduction
d
Chlorine gives addition products with low molecular weight unsaturated hydrocarbons.
answer is C.
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Detailed Solution
The bleaching action of chlorine water is due to oxidation.H2O + Cl2→ HCl + HOCl.Hypochlorous acid is unstable and decomposes to give nascent oxygen.Thus moist chlorine acts as oxidant and bleaching agent.HOCl →HCl + (O)