Which of the following ions have zero value of magnetic moment?

S c^{3 +}

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T i^{4 +}

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Z n^{2 +}

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None of these

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Solution

The correct option is A $S c^{3 +}$
It's because $S c^{3 +}$ does not have any electrons left in its d orbital. Sc has theelectron configuration $[A r] (4 s)^{2} (3 d)^{1}$ but in order to get its +3 oxidation state, it has to lose 3 electrons, starting with the two 4s electrons and followed by the lone 3d electron.
Hence n=0 which makes magnetic moment zero.

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Similar questions

C u^{+}, F e^{2 +}, M n^{2 +}, C r^{3 +}, S c^{3 +}, T i^{4 +}

Which of the following sets contain only isoelectronic ions?
(i) $Z n^{2 +}, C a^{2 +}, G a^{3 +}, A l^{3 +}$

(ii) $K^{+}, C a^{2 +}, S c^{3 +}, C l^{-}$

(iii) $P^{3 -}, S^{2 -}, C l^{-}, K^{+}$

(iv) $T i^{4 +}, A r, C r^{3 +}, v^{5 +}$

Which of the following ions should have highest magnetic moment?

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