A) \[4.5\times {{10}^{4}}\]
B) \[5\times {{10}^{-4}}\]
C) \[2.5\times {{10}^{-4}}\]
D) \[6\times {{10}^{4}}\]
Correct Answer: A
Solution :
As \[K=\frac{\text{Rate of forward reaction}}{\text{Rate of backward reaction}}=\frac{{{K}_{t}}}{{{K}_{b}}}\] \[=\frac{7.5\times {{10}^{-4}}}{{{K}_{b}}}\] or \[{{K}_{b}}=\frac{7.5\times {{10}^{-4}}}{1.5}\] \[=5\times {{10}^{-4}}\] Hence, the correct option is (a).
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