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Question

Which equation do not represent enthalpy change of reaction which correspond to the standard enthalpy change of atomisation of chlorine?

A
12Cl2(g)Cl(g)
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B
12Cl2(l)Cl(g)
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C
Cl2(g)2Cl(g)
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D
Cl2(l)2Cl(g)
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Solution

The correct option is D Cl2(l)2Cl(g)
Enthalpy of atomisation ΔaHo is the change in enthalpy when one mole of bond is completely broken to obtain atom in the gas phase.
Cl2(g)2Cl(g)
Enthalpy change of the above reaction corresponds to standard enthalpy change of atomisation of chlorine as here one mole of chlorine gas is converted to 2 mole of chlorine atoms.

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