Question

99% of a first order reaction was completed in 32 minutes. When will 99.9% of the reaction complete?

• A. 48 minute
• B. 49 minute
• C. 46 minute
• D. 50 minute

Hint:

For first-order reactions: \[ t_{90%} : t_{99%} : t_{99.9%} = 1 : 2 : 3 \] Use this direct ratio method to solve questions quickly.

Answer 1

The Correct Option is A