Use As = 75, O = 16. Arsenic(III) is oxidised to arsenic(V) by iodine (I2 is reduced to I-). The volume of 0.1 M I2 required for 0.495 g of As2O3 is:

JEE Main levelSingle correct optionDifficulty 2 of 3rx130

Use As = 75, O = 16. Arsenic(III) is oxidised to arsenic(V) by iodine ( $I X_{2}$ is reduced to $I X^{-}$ ). The volume of $0.1 M$ $I X_{2}$ required for $0.495 g$ of $As X_{2} O X_{3}$ is:

M (As X_{2} O X_{3}) = 198

and

n = 4

(two As, 2 e

^{-}

each), so equivalent mass

= 49.5

. Equivalents

= 0.495/49.5 = 0.01

(10 meq).

I X_{2}

has

N = 0.1 \times 2 = 0.2

, so

V = 10/0.2 = 50 mL