Correct relation among X_A, X_B and Δ, where X_A and X_B are the electronegativities of elements A and B.

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X_A- X_B = 0.208 $\sqrt{∆}$

X_A + X_B = 0.208 $\sqrt{∆}$

\large \sqrt {{X_A}{\text{ - }}{X_B}} = 0.208\Delta \

{X_A} - {\text{ }}{X_B} = {\text{ }}\sqrt {0.208\Delta } \

answer is C.

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Detailed Solution

${X_A} - {X_B} = 0.208\sqrt {\Delta} \$ is the formula to calculate electro negativity using pauling scale. Δ_AB is the difference in the observed bond dissociation enthalpy and calculated bond dissociation enthalpy

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