AP EAMCET previous year questions solved

 

Question: 

The number of elements among O, Cl, F, N, P,

Sn, Ti, K, Sc, which show more than one

non-zero oxidation state is [21 Sep. 2020, Shift-I]

(a) 2 (b) 3 (c) 6 (d) 8

Answer:  (c)

Detailed Solution : 

Sodium (+1), 

scandium (+3) 

and fluorine (−1)  show only one non-zero oxidation state.

(1) The oxidation states of oxygen are −1, −2 and +2.

(2) The oxidation states of chlorine range from −1 to +7.

(3) The oxidation states of nitrogen and phosphorus range from −3 to +5.

(4) The oxidation states of tin range from +2 to +4.

(5) The oxidation states of scandium is +3.

 

Note: Scandium (Z = 21) does not exhibit variable oxidation states and yet it is regarded as a transition element because scandium has

partially filled d-orbitals in the ground state.

(6) The oxidation states of titanium are +2,+3 ,+4 respectively.

Hence, the correct option is (c).