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JEE Advanced levelSingle correct optionDifficulty 3 of 3hx201

Methane (8.0 g, atomic masses C 12, H 1, Cl 35.5) is completely chlorinated to $CCl X_{4}$ with excess chlorine under UV light. The mass of $Cl X_{2}$ consumed is

A142 g
B71 g
C284 g
D35.5 g

Answer: A

CH X_{4} + 4 Cl X_{2} CCl X_{4} + 4 HCl

. Moles of methane

= 8.0/16 = 0.50

. Moles of

Cl X_{2}

= 4 \times 0.50 = 2.0

; mass

= 2.0 \times 71 = 142

g.

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