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3.55 grams of chlorine gas liberates ‘Q’ kJ of heat by gaining electrons. Electron gain enthalpy of chlorine is ________ kJ/mole

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-5 Q

-10 Q

-20 Q

-2.5 Q

answer is B.

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Detailed Solution

$C l (g) + \bar{e} \to C l^{-} (g)$

3.55 grams liberate ‘Q’ kJ

35.5 grams liberate 10 Q kJ

$∴ ∆ H_{E G} = - 10 Q$

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