MCQ
Depletion of ozone layer is caused by
- ✓Freon
- BAlkane
- CGringard reagent
- DAll of these
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$(I)$ Mond's process for purification of nickel
$(II)$ Removal of unreacted $AgBr$ from photographic plate
$(III)$ Removal of lead poisoning from the body
$I$ $-$ $II$ $-$ $III$
(Rounded-off to the nearest integer)
[Given $K _{ b }$ for $\left.\left( H _{2} O \right)=0.52\, K\, kg\, mol ^{-1}\right]$