Question

The oxidation of certain metal is found to obey the equation A² = at + b, where A is the thickness of the oxide film at time t, a&b are constant. The order of the reaction is -

• A. 1
• B. 2
• C. – 1
• D. Can’t be determined

Answer 1

Answer: (C)

– 1

Answer 2

A² = at + B ̃ 2A $\frac{dA}{dt}$ = a $\frac{dA}{dt}$ = $\frac{\alpha}{2A}$ ̃ $\frac{dA}{dt} = \frac{\alpha}{2}A^{–1}$

Order = – 1