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Match List I with List II
List I
Coordination complex List II
Number of unpaired electrons
A) [Cr(CN)₆]^3- I) 0
B) [Fe(H₂O)₆]²⁺ II) 3
C) [Co(NH)₆]³⁺ III) 2
D) [Ni(NH₃)₆]²⁺ IV) 4
Choose the correct answer from the options given below
A B C D
1) II IV I III
2) IV II II I
3) II I IV III
4) III IV I II

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answer is A.

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Detailed Solution

${[Cr (CN)_{6}]}^{3 -} [Ar] 3 d^{3} 4 s^{0} = {Cr}^{3 +}$ Question Image
${[Fe {(H_{2} O)}_{6}]}^{2 +} [Ar] 3 d^{6} 4 s^{0}$

${[Co {({NH}_{3})}_{6}]}^{3 +} [Ar] 3 d^{6} 4 s^{0}$

${[Ni {({NH}_{3})}_{6}]}^{2 +} [Ar] 3 d^{8} 4 s^{0}$

A – II, B – IV, C – I , D - III

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