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The number of complexes from the following containing an even number of unpaired ‘d’ electrons is ____
${[V {(H_{2} O)}_{6}]}^{3 +}; {[Cr {(H_{2} O)}_{6}]}^{2 +}, {[Fe {(H_{2} O)}_{6}]}^{3 +} {[Ni {(H_{2} O)}_{6}]}^{3 +}$
[Given atomic numbers : V=23, Cr=24, Fe=26; Ni=28]

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answer is B.

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Detailed Solution

${[V {(H_{2} O)}_{6}]}^{3 +} V^{3+} \to 3 d^{2} n = 2 (e v e n)$

${[C r {(H_{2} O)}_{6}]}^{2 +} {Cr}^{2+} - 3 d^{4} n=4(even)$

${[F e {(H_{2} O)}_{6}]}^{3 +} {Fe}^{3+} - 3 d^{+ 5} n=5(odd)$

${[N i {(H_{2} O)}_{6}]}^{3 +} {Ni}^{3+} - 3 d^{7} n=3 (odd)$

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