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For a reaction scheme C B A 2 1 k k ⎯→ ⎯ ⎯→ ⎯ , if the rate of formation of B is set to be zero then the concentration of B is given by -

1. (k 1 – k 2 ) [A]
2. k 1 k 2 [A]
3. (k 1 + k 2 ) [A]
4. ] A [ k k 2 1 ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛

Correct answer: ] A [ k k 2 1 ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛

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