Which one of the following species is stable in aqueous solution ?
$Cr^{2+}$
$MnO_4^{2 - }$
$MnO_4^{3 - }$
$Cu^+$
Which of the following ions has the highest magnetic moment
Which one of the following when dissolved in water gives coloured solution in nitrogen atmosphere?
Cuprous ion is colourless while cupric ion is coloured because
In first transition series, the melting point of $Mn$ is low because
What are inner transition elements? Decide which of the following atomic numbers are the atomic numbers of the inner transition elements: $29,59,74,95,102,104$ .