An element of atomic number $29$ belongs to

The metal with the highest oxidation state present in $K_2CrO_4$,$NbCl_5$,and $MnO_2$ is

Which of the following ions will exhibit colour in aqueous solution?

Which of the following ions exhibit the same value of spin-only magnetic moment? $(A)$ $Ti^{3+}$, $(B)$ $Cr^{3+}$, $(C)$ $Mn^{2+}$, $(D)$ $Fe^{3+}$, $(E)$ $Sc^{3+}$. Choose the most appropriate answer from the options given below.

$A$ substance contains an $M^{3+}$ ion with the electronic configuration $[Ar]3d^1$. The ion is........

In the $3d$ series of the $d$-block elements,which element has the maximum atomic size?