# NEET Chemistry Chemical Kinetics Questions Solved

Two substances A and B are present such that  and half life of A is 5 minute and that of B
is 15 minute. If they start decaying at the same time following first order kinetics how much time later will the concentration of both of them would be same.

(A) 15 minute

(B) 10 minute

(C) 5 minute

(D) 12 minute

(A) Amount of A left in ${n}_{1}$ halves

Amount of B left in ${n}^{2}$ halves

At the end, according to the question

(Let concentration of both become equal after time t)

For equation (1) and (2)

Difficulty Level:

• 35%
• 32%
• 11%
• 25%
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