- A

- B

- ✓

- D






$\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{NH}_{2}$
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$A.$ Chlorophyll - Co
$B.$ Water hardness - EDTA
$C.$ Photography $-\left[ Ag ( CN )_2\right]^{-}$
$D.$ Wilkinson catalyst - $\left[\left(P h_3 P\right)_3 R h C l\right]$
$E.$ Chelating ligand - D - Penicillamine
Choose the correct answer from the options given below:


$\mathrm{A}+\mathrm{B} \rightarrow \mathrm{C}$
$\text { rate }=\mathrm{k}[\mathrm{A}]^{1 / 2}[\mathrm{~B}]^{1 / 2}$
The reaction is initiated by taking $1 \mathrm{M}$ concentration $A$ and $B$ each. If the rate constant $(k)$ is $4.6 \times 10^{-2} \mathrm{~s}^{-1}$, then the time taken for $\mathrm{A}$ to become $0.1 \mathrm{M}$ is . . . . . . . . . . sec. (nearest integer)
