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(C) $50 \,\%$ ionic character occurs when the electronegativity difference between the atoms is equal to $1.7$. This is evident from curve $C$,which s

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$C$

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(C) $50 \,\%$ ionic character occurs when the electronegativity difference between the atoms is equal to $1.7$. This is evident from curve $C$,which shows that as the electronegativity difference increases,the percent ionic character increases,reaching $50 \,\%$ at $\Delta E.N. = 1.7$. $\Delta E.N. = 1.7 \Rightarrow 50 \,\% 	ext{ ionic and } 50 \,\% 	ext{ covalent}$ $\Delta E.N. > 1.7 \Rightarrow 	ext{more than } 50 \,\% 	ext{ ionic and less than } 50 \,\% 	ext{ covalent}$ $\Delta E.N. < 1.7 \Rightarrow 	ext{less than } 50 \,\% 	ext{ ionic and more than } 50 \,\% 	ext{ covalent}$

For $AB$ bond,if percent ionic character is plotted against electronegativity difference $(X_A - X_B)$,the shape of the curve would look like. The correct curve is:

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