Which of the following pairs of elements has the electronic configuration $(n - 1)d^{10} ns^2$?

Which of the following groups of transition metals is known as coinage metals?

Which of the following ions has the least magnetic moment?

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:

The common positive oxidation states for an element with atomic number $24$ are:

Which of the following substances is not paramagnetic?