Question

Which is the relation between half life and rate constant for a zero order?

विकल्प

• `"t"_(1//2) = (["A"])/k`

• `"t"_(1//2) = (2["A"]_0)/k`

• `"t"_(1//2) = (["A"]_0)/(2k)`

• `"t"_(1//2) = 0.693/k`

Answer 1

`"t"_(1//2) = (["A"]_0)/(2k)`

Explanation:

The expression for zero order reaction,

k = `(["A"]_0 - ["A"])/"t"`

On putting, t = `"t"_(1//2), "A"= (["A"_0])/2`

Then, k = `(["A"]_0 - ["A"]_0//2)/("t"_(1//2))`

On rearrangement `"t"_(1//2) = ["A"]_0/(2"k")`