Question

The quantity of electricity required to reduce 12.3 g of nitrobenzene to aniline assuming 50% current efficiency is

• A. 115800 Coulombs
• B. 57900 Coulombs
• C. 231600 Coulombs
• D. 28950 Coulombs

Answer 1

Answer: (A)

115800 Coulombs

Answer 2

$\mathbf{C}_{\mathbf{6}}\mathbf{H}_{\mathbf{5}}\mathbf{N}\mathbf{O}_{\mathbf{2}}\mathbf{+ 6}\mathbf{H}^{\mathbf{+}}\mathbf{+ 6}\mathbf{e}^{\mathbf{-}}\mathbf{\rightarrow}\mathbf{C}_{\mathbf{6}}\mathbf{H}_{\mathbf{5}}\mathbf{N}\mathbf{H}_{\mathbf{2}}$ i.e., 1 mole (123 g) require $6 \times 96500C.$

Hence 12.3 g will require $= 6 \times 9650C.$ As current efficiency is 50%, quantity of electricity actually required

$= 2 \times 6 \times 9650 = 115800C.$