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Among the following the number of elements showing only one non-zero oxidation state ___<br>O, Cl, F, N, P, Sn, Tl, Na, Ti
Correct Answer: 2
Fluorine shows only $$-1$$ and sodium only $$+1$$ in their compounds. Oxygen shows $$-2$$, $$-1$$ and $$+2$$; Cl, N and P show many states; Sn shows $$+2$$ and $$+4$$, Tl $$+1$$ and $$+3$$, and Ti $$+2$$, $$+3$$ and $$+4$$. So the number is 2.
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