KCET 2021 Chemistry Solved Paper

For the reaction,
A+2B→ Products
Half-life (t

1

2

) remains same as [B] increases for 1st order, t1∕2∝

l

[B]

∴ w.r.t. B, reaction is of first order.
Also, as [A] is doubled, rate remains constant.
∴ It is zero order w.r.t. A.
∴ Rate law expression is k[A]0[B]1
∴ Overall order =0+1=1
∴ Unit of k=s−1