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The answer to each of the following ques...

The answer to each of the following question is a single digit integer, ranging from 0 to 9. If the correct answers to the question numbers A, B, C and D (say) are 4, 0, 9 and 2 respectively, then the correct darkening of bubbles should be as shown on the side:

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

Text Solution

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The correct Answer is:
2
Non-zero oxidation states of O are `-1,-2` , that of Cl are `-1, +1, +3, +5 and +7` , that of F is `-1`, that of P are `-3,-2,+1,+3 and +5` , that of Sn are `+2 and +4` , that of Tl are 1 and and `+3` , that of Na is `+1` and that of Ti are `+2,+3 and +4`.
Thus, only F and Na can exist in one zero oxidation state.
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