Which of the following order is incorrect ?

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 :

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$1\, \mathrm{~kg}$ of $0.75$ molal aqueous solution of sucrose can be cooled up to $-4^{\circ} \mathrm{C}$ before freezing. The amount of ice (in $g$) that will be separated out is .... . (Nearest integer)

$\left[\right.$ Given $\left.: \mathrm{K}_{\mathrm{f}}\left(\mathrm{H}_{2} \mathrm{O}\right)=1.86\, \mathrm{~K}\, \mathrm{~kg}\, \mathrm{~mol}^{-1}\right]$

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Artificial sweetner that is unstable at cooking temperature is

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A tetrapeptide has $- COOH$ group on alanine. This produces glycine $(Gly)$, valine $(Val)$, phenyl alanine $(Phe)$ and alanine $(Ala)$, on complete hydrolysis. For this tetrapeptide, the number of possible sequences (primary structures) with $- NH _2$ group attached to a chiral center is:

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Total number of $d$ electrons present an element with atomic no. $78$ is

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In which of the following redox reaction precipitate is not formed ?

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Hydrolysis of which of the following is not the example of redox reaction?

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The ionic product of water at ${25\,^o}C$ is ${10^{ - 14}}.$ The ionic product at ${90\,^o}C$ will be