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Solution


Q.

The set of correct statements is:                               [2023]

(i) Manganese exhibits +7 oxidation state in its oxide.

(ii) Ruthenium and Osmium exhibit +8 oxidation in their oxides.

(iii) Sc shows +4 oxidation state which is oxidizing in nature.

(iv) Cr shows oxidising nature in +6 oxidation state.
1 (i) and (iii)  
2 (ii) and (iii)  
3 (i), (ii) and (iv)  
4 (ii), (iii) and (iv)  

Ans.

(3)

Sc21=3d14s2 can show maximum +3 oxidation state but does not show +4 oxidation state.