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A and B are two elements whose electro negativities are $X_{A}$ and $X_{B}$ here $X_{A} > X_{B}$ . then the bond length of $d_{A - B}$ is given by

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d_{A B} = r_{A} + r_{B} - 0.09 (X_{A} - X_{B})

d_{A B} = r_{A} - r_{B} + 0.99 (X_{A} - X_{B})

d_{A B} = r_{A} + r_{B} - 0.99 (X_{A} + X_{B})

d_{A B} = r_{A} + r_{B} - 0.09 (X_{A} + X_{B})

answer is A.

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d_{A B} = r_{A} + r_{B} - 0.09 (X_{A} - X_{B})

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