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Q.

The charge on $1 g - ion$ of ${Al}^{3 +}$ is : ( $N_{A} =$ Avogadro's umber, $e =$ charge on one electron)

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a

$\frac{1}{3} \times N_{A} e$ Coulomb

b

$3 \times N_{A} e$ Coulomb

c

$\frac{1}{9} \times N_{A} e$ Coulomb

d

$\frac{1}{27} N_{A} e$ Coulomb

answer is D.

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Detailed Solution

In 1 gram of ion,
$1 g - ion = 1$
mole;
$1 g 1 \times N_{A} \times 3 \times e$
Thus, option d is correct.

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