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Chemistry Chemical Kinetics General Single Correct MCQ
Published on: August 13, 2026

The inversion of cane sugar proceeds with half life of 500 minute at pH = 5 for any concentration of sugar. However, if pH = 6, the half life changes to 50 minute. The rate law expression for the sugar inversion can be written as -

A
R = K(sugar) 2 (H + ) 0
B
R = K(sugar) 1 (H + ) 0
C
R = K(sugar) 1 (H + ) 1
D
R = K(sugar) 0 (H + ) 1

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The correct answer is:
B

At , the half-life is 500 min for all concentrations of sugar, i.e, .
Thus, the reaction is I order w.r.t. sugar
Now rate
Also for

or
Therefore, rate

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