GATE 2026 BT – Question 60

Fundamentals of Biological Engineering · Bioreaction Engineering: Rate law, zero and first order kinetics, Michaelis-Menten kinetics and enzyme inhibition · 2 marks · Numerical answer

A substrate is consumed in a zero order reaction such that its concentration falls from 42 g L$^{-1}$ to 14 g L$^{-1}$ in 4 hours. The total time taken for complete utilization of substrate will be ________ hours. (answer in integer)

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Correct answer: 6

Explanation

The zero-order rate is constant: $\frac{42 - 14}{4} = 7$ g L$^{-1}$ h$^{-1}$. The complete utilisation of the 42 g/L takes $\frac{42}{7} = 6$ h in total.