The correct order of the first ionization enthalpies is:

Ferrous ion changes to $X$ ion upon reacting with acidified hydrogen peroxide. The number of $d$-electrons present in $X$ and its magnetic moment (in $BM$) are,respectively:

Which of the following statements is correct regarding $d-$block elements?

Which of the following pairs of ions may exhibit the same colour?

Besides $Zn$ and $Cu$,german silver contains the metal

Match List-$I$ with List-$II$:

List-$I$ ($\text{Transition metal ion}$)	List-$II$ ($\text{Spin only magnetic moment (B.M.)}$)
$A$. $Ti^{3+}$	$I$. $3.87$
$B$. $V^{2+}$	$II$. $0.00$
$C$. $Ni^{2+}$	$III$. $1.73$
$D$. $Sc^{3+}$	$IV$. $2.84$

Choose the correct answer from the options given below: