The electrochemical equivalent of a trivalent metal is 9.33x 10^-5 g C^-1. Taking F = 96500 C mol^-1, the molar mass of the metal is approximately

JEE Main levelSingle correct optionDifficulty 2 of 3ec136

The electrochemical equivalent of a trivalent metal is $9.33 \times 1 0^{- 5} g C^{- 1}$ . Taking $F = 96500 C mo l^{- 1}$ , the molar mass of the metal is approximately

Electrochemical equivalent

Z = \frac{M}{n F}

is the mass deposited per coulomb. So

M = Z n F = 9.33 \times 1 0^{- 5} \times 3 \times 96500 = 27.0 g mo l^{- 1}

. The metal is aluminium. Option (A) forgets the factor

n = 3