Among the following, the number of elements showing only one non-zero oxidation state is O, Cl, F, N, P, Sn, Tl, Na, Ti

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Solution

The correct option is A 2
Sodium (+1) and fluorine (-1) show only one non zero oxidation state.
The oxidation states of oxygen are -1, -2 and +2.
The oxidation states of chlorine range from -1 to +7.
The oxidation states of nitrogen and phosphorus range from -3 to +5.
The oxidation states of tin range from +2 to +4.
The oxidation states of thalium are +1 and +3. +3 oxidation state is rare but does exist.
The oxidation states of titanium are +2, +3, +4 respectively.

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