The colorless species is

Which one amongst the following are good oxidizing agents?

$A.$ $Sm ^{2+}$    $B.$ $Ce ^{2+}$   $C.$ $Ce ^{4+}$    $D.$ $Tb ^{4+}$

Choose the most appropriate answer from the options given below :

Percentage of silver in German silver is

The transition element that has lowest enthalpy of atomisation is

A compound of a metal ion $M^{x+}$ $(Z = 24)$ has a spin only magnetic moment of $\sqrt {15}$ Bohr Magnetons. The number of unpaired electrons in the compound are

Which one of the following compounds is not coloured