1. Tardigrade
  2. Question
  3. Chemistry
  4. Most transition metals I. form sets of compounds which display different oxidation states of the metal II. form coloured ions in solution III. burn vigorously in oxygen IV. replace H2 from dilute acids of these.

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Q. Most transition metals
I. form sets of compounds which display different oxidation states of the metal
II. form coloured ions in solution
III. burn vigorously in oxygen
IV. replace $H_2$ from dilute acids of these.

The d-and f-Block Elements

Solution:

I. True, due to involvement of ns-electrons in bonding.
II. True, due to unpaired electrons in d-orbitals.
III. Since, $E^{\circ}\left(M^{2+}/M\right) = +ve\quad ∴ E^{\circ}\left(M/M^{2+}\right) = -ve$
Thus oxidation of the metal is not easy. Thus, false.
IV. They do not displace $H_2$ with dilute acid based on $E^{\circ}$ values. Thus false. Thus I and II are true.