Electronic Configuration of d-Block Elements

Match the following:

$\begin{array}{cccc}\left(\mathrm{a}\right)& {\mathrm{Cr}}^{3+}& \left(\mathrm{i}\right)& \left[\mathrm{Ar}\right]3{\mathrm{d}}^{10}\\ \left(\mathrm{b}\right)& {\mathrm{Cu}}^{+}& \left(\mathrm{ii}\right)& \left[\mathrm{Xe}\right]4{\mathrm{f}}^4\\ \left(\mathrm{c}\right)& {\mathrm{Co}}^{2+}& \left(\mathrm{iii}\right)& \left[\mathrm{Ar}\right]3{\mathrm{d}}^5\\ \left(\mathrm{d}\right)& {\mathrm{Mn}}^{2+}& \left(\mathrm{iv}\right)& \left[\mathrm{Ar}\right]3{\mathrm{d}}^7\\ \left(\mathrm{e}\right)& {\mathrm{Pm}}^{3+}& \left(\mathrm{v}\right)& \left[\mathrm{Ar}\right]3{\mathrm{d}}^3\end{array}$

Identify the value of $\mathrm{k}$ in the electronic configuration of chromium, $\left[\mathrm{Ar}\right]3{\mathrm{d}}^5$_____ from the given options:
(A) $4{\mathrm{s}}^1$
(B) $4{\mathrm{s}}^2$
(C) $4{\mathrm{s}}^3$

Enter your correct answer as A, B or C.

Which of the following $3\mathrm{d}$ series elements having correct electronic configuration:

The correct statements(s) about ${\mathrm{Cr}}^{2+}$and ${\mathrm{Mn}}^{3+}$ is (are)

Which of the following ions have the same numbers of unpaired electrons?

Why does copper show abnormal electronic configuration?

Why chromium has electronic configuration $3{\mathrm{d}}^5 4{\mathrm{s}}^1$ and not $3{\mathrm{d}}^{4 }4{\mathrm{s}}^2$?

Why is manganese more stable in the $+2$ state than the $+3$ state and the reverse is true for iron?

From the following, the correct statement is/are?
a. Oxidation potential $\left(\mathrm{M}/{\mathrm{M}}^{2+}\right)$ of $\mathrm{Cu}$ is least in $3\mathrm{d}$ series.
b. ${\mathrm{Fe}}^{3+}$ is more stable than ${\mathrm{Mn}}^{3+}$ in aqeous solution.
c. Exchange energy is more in case of ${\mathrm{Fe}}^{3+}$ than ${\mathrm{Mn}}^{3+}$.
d. First IE of Mn is more than that of Fe.

The group of the element in periodic table having electronic configuration  $\left[\mathrm{A}\mathrm{r}\right]3{\mathrm{d}}^6\mathrm{ }4{\mathrm{s}}^2$ is-

Which of the following compounds is colored and paramagnetic?

Which of the following ionic species contains the maximum number of unpaired electrons? 

The number of d-electrons in $F{e}^{2+}\left(Z=26\right)$ is not equal to that of

Which one of the following ions has same number of unpaired electrons as those present in $V^{3+}$ ion?

Which one of the following ions has same number of unpaired electrons as those present in $V^{3+}$ ion?

What is the atomic number of the element with $M^{2+}$ ion having electronic configuration $\left[Ar\right]3d^8$ ?

What is the atomic number of the element with $M^{2+}$ ion having electronic configuration $\left[Ar\right]3d^8$ ?

The elements with the outer electronic configuration $3{\mathrm{d}}^6\mathrm{ }4{\mathrm{s}}^2$ is a:

$\mathrm{T}{\mathrm{i}}^{4+}$ is isoelectronic with -

Which of the following has maximum number of unpaired electrons?