2. Electrochemistry — Chemistry STD 12 Science — Question

$Fe|FeSO_4$         $E^o_{OP} = 0.44\, V$        $(a = 0.1\, M)$

Assertion $A:$ $3.1500\,g$ of hydrated oxalic acid dissolved in water to make $250.0\,mL$ solution will result in $0.1\,M$ oxalic acid solution.

Reason $R:$ Molar mass of hydrated oxalic acid is $126\,g\,mol ^{-1}$.

In the light of the above statements, chose the correct answer from the options given below:

$(I)\,[Cr(NO_3)_3(NH_3)_3]$  $(II)\, K_3[Fe(C_2O_4)_3]$  $(III)\,[CoCl_2(en)_2]^+$  $(IV)\, [CoBrCl(ox)_2]^{3-}$

$(i)$ ${A_2} \to A + A$ (fast)

$(ii)$ $A + {B_2} \to AB + B$ (slow)

$(iii)$ $A + B \to $ (fast)