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Question

Which one of the following is incorrect?


A

An element which has high electro negativity always has high electron gain enthalpy

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B

Electron gain enthalpy is the property of an isolated atom

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C

Electro negativity is the property of a bonded atom

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D

Both electro negativity and electron gain enthalpy are usually directly related to nuclear charge and inversely related to atomic size

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Solution

The correct option is A

An element which has high electro negativity always has high electron gain enthalpy


Elements with high electronegativity usually have high electron gain enthalpies, but this does not happen all the time.

If you take the example of nitrogen, it's electronegativity is one of the highest.

But if you look at its electron gain enthalpy, you actually need to supply energy to add the electron because nitrogen has a half-filled configuration which is stable.

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