MCQ
Select the correct statement
- APhotography is based upon photosensitivity of silver halide mainly $AgBr$
- BSodium thiosulphate is used to remove the unexposed $AgBr$ from photographic film
- C$AuCl_3$ is used in toning
- ✓All are correct
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$(1)$ $Fe^{3+}$ gives brown colour with potassium ferricyanide
$(2)$ $Fe^{2+}$ gives blue colour with potassium ferricyanide
$(3)$ $Fe^{3+}$ gives red colour with potassium thiocyanate
$(4)$ $Fe^{2+}$ gives brown colour with ammonium thiocyanate

$ ii. $
$iii.$
$ iv.$ 
(given, $\frac{ F }{ R }=11500 K V ^{-1}$, where $F$ is the Faraday constant and $R$ is the gas constant, The value of $\ln (10)=2.30$ )