The element which shows only one oxidation state other than its elemental form is:

Transition elements show high melting points. Why?

Why does zinc not exhibit variable oxidation states?

Which of the following is most paramagnetic?

The $CORRECT$ ionisation energy order is

If the colours of salts of transition elements are due to the presence of unpaired electrons in the transition metal ions,which of the following ions will be colourless in aqueous solution? (The atomic numbers of $Ti$ and $Fe$ are $22$ and $26$ respectively.)