Consider the following statements for transition elements.
(I) form sets of compounds which disply different oxidation states of the metal.
(II) from coloured ions in solution.
(III) burn vigorously in presence of oxygen.
(IV) replace `H_(2)` from dilute acids.

Options

A. I,II III are correct
B. II,III,Iv are correct
C. I,II are correct
D. All are correct

Answer

C

Explanation

(I) True, due to involvement of ns electrons in bonding.
(II) True, due to unpaired electrons in d-orbitals.
(III) Since, `E_((M^(2+)//M))^(@)=+ve`
`E_((M//M^(2+)))^(@)=-ve `
Thus oxidation of the metal is not easy. Hence, false.
(Iv) They do not displeace `H_(2)` with dilute acid as per their `E^(o)` values. Hence, false.
only I nad II are true statements .