Assertion: The unit of rate constant is (mole)1-n (litre)n-1 time-1 .
Reason: The unit of rate constant for first order reaction is s-1.
Answer & explanation
Correct answer: option 1
The unit of rate constant is (mole)1-n (litre)n-1 time-1 , n = order of reaction
For first order reaction, n = 1
(mole)1-1 (litre)1-1 s-1 = (mole)0 (litre)0 s-1 = s-1