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Q.

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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a

-5 Q

b

-10 Q

c

-20 Q

d

-2.5 Q

answer is B.

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Detailed Solution

Cl(g)+e¯→Cl−(g)

3.55 grams liberate ‘Q’ kJ

35.5 grams liberate 10 Q kJ

∴∆HEG=-10Q

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