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a
Bleaching property of chlorine is temporary
b
It oxidizes H2S to SCl2
c
It oxidizes ethene to ethylene dichloride (in CCl4solvent )
d
It is a dry bleach
answer is C.
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Detailed Solution
Oxidation state of carbon in ethene is -2 and in ethylene dichlorideC2H4Cl2 is -1.It oxidizes H2S to sulphurChlorine bleaches in moist conditions. Bleaching by chlorine is permanantCl2 +H2O →HCl +HOCl HOCl →HCl +O