A molecule $H - X$ will be 50% ionic if electronegativity difference of $H$ and $X$ is:

1.2

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1.4

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1.5

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1.7

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Solution

The correct option is C $1.7$ eV
Pauling considered that the partial ionic character of a bond is an approximate function of the difference in electronegativity between the two bonded atoms. He estimated that a difference of $1.7$ corresponds to $50$ % ionic character, so that a greater difference corresponds to a bond which is predominantly ionic.

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A molecule H−X will be 50% ionic if electronegativity difference of H and X is:

A molecule $H - X$ will be 50% ionic if electronegativity difference of $H$ and $X$ is: