Which is not true for transition elements
They are all metals
They show variable valency
They form coloured ions
They do not form co-ordinate compounds
$CuSO_4(aq) + 4NH_3 \rightarrow X,$ then $X$ is
The $CORRECT$ ionisation energy order is
Which of the following sulphides is yellow in colour
Explain trends in $M^{2+}/M$ standard electrode potentials.
Which of the following compounds is metallic and ferromagnetic ?