7. Alcohol, phenol and ethers — Chemistry STD 12 Science — Question

[Atomic numbers of $Cr =24$ and $Mn =25$ ]

$(A)$ $Cr ^{2+}$ is a reducing agent

$(B)$ $Mn ^{3+}$ is an oxidizing agent

$(C)$ Both $Cr ^{2+}$ and $Mn ^{3+}$ exhibit $d^4$ electronic configuration

$(D)$ When $Cr ^{2+}$ is used as a reducing agent, the chromium ion attains $d^5$ electronic configuration

$\frac{{ - d\left[ {{N_2}{O_5}} \right]}}{{dt}} = k\left[ {{N_2}{O_5}} \right]$ , 

$\frac{{d\left[ {N{O_2}} \right]}}{{dt}} = k'\left[ {{N_2}{O_5}} \right]$,

$\frac{{d\left[ {{O_2}} \right]}}{{dt}} = k''\left[ {{N_2}{O_5}} \right]$

The relationship between $k$ and $k'$ and between $k$ and $k^{"}$ are