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In a chemical reaction, A + 2B K 2C+D, the initial concentration of B was 1.5 times of the concentration of A, but the equilibrium concentrations of A and B were found to be equal. The equilibrium constant (K) for the aforesaid chemical reaction is -

1. 16
2. 1
3. 1/4
4. 4

Correct answer: 4

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