The colour of $_{62}{\rm{S}}{{\rm{m}}^{3 + }}$ is yellow. The expected colour of ${{\rm{\;}}_{66}}{\rm{D}}{{\rm{y}}^{3 + }}$ is

An ion has a spin-only magnetic moment of $\sqrt{24}$ BM. Which of the following electronic configurations could it have?

The substance that sublimes on heating is:

Which of the following are $d$-block elements but not regarded as transition elements?

Silver nitrate produces a black stain on skin due to:

For $d$-block elements the first ionisation potential is of the order

The common metal in brass, bronze and german silver is:

Addition of high proportions of manganese makes steel useful in making rails of rail roads because manganese ;

${\rm{HgC}}{{\rm{l}}_2}$ is reduced to ${\rm{H}}{{\rm{g}}_2}{\rm{C}}{{\rm{l}}_2}$ by:

Which of the following pair is coloured in aqueous solution?

Consider the tripositive ions of Sm, Eu, Gd, and Yb. Which of these ions are paramagnetic?