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Assertion $A$ : $\left[ CoCl \left( NH _3\right)_5\right]^{2+}$ absorbs at lower wavelength of light with respect to $\left[ Co \left( NH _3\right)_5\left( H _2 O \right)\right]^{3+}$
Reason $R$ : It is because the wavelength of the light absorbed depends on the oxidation state of the metal ion.
In the light of the above statements, choose the correct answer from the options given below :
The following data are observed
| $[X_2]$ | $[Y_2]$ | Rate of appearance of $XY$ ($M/sec$) |
| $0.1$ | $0.1$ | $5 × 10^{-6}$ |
| $0.2$ | $0.1$ | $10^{-5}$ |
| $0.2$ | $0.2$ | $4 × 10^{-5}$ |
Rate constant of reaction will (in $M^{1-n}\,sec^{-1}$) where $'n'$ is order of reaction
