NEET · Chemistry · STD 12 - 5. Co-ordination chemistry
Which of the following are paramagnetic?
A. \(\left[ NiCl _4\right]^{2-}\)
B. \(Ni ( CO )_4\)
C. \(\left[ Ni ( CN )_4\right]^{2-}\)
D. \(\left[ Ni \left( H _2 O \right)_6\right]^{2+}\)
E. \(Ni \left( PPh _3\right)_4\)
Choose the correct answer from the options given below :
- A A and C only
- B B and E only
- C A and D only
- D A, D and E only
Answer & Solution
Correct Answer
(C) A and D only
Step-by-step Solution
Detailed explanation
(A) \(\left[ NiCl _4\right]^{2-} \Rightarrow\) Oxidation state \(=+2\)
Electronic configuration \(=3 d^8 4 s^0\)
\(Cl =\) W.F.L. No Pairing
(D) \(\left[ Ni \left( H _2 O \right)_6\right]^{2+}\)
Oxidation state \(=+2\), configuration \(=3 d^8\)
\(H _2 O\) is W.F.L. No pairing
Hence both are paramagnetic.
Electronic configuration \(=3 d^8 4 s^0\)
\(Cl =\) W.F.L. No Pairing
(D) \(\left[ Ni \left( H _2 O \right)_6\right]^{2+}\)
Oxidation state \(=+2\), configuration \(=3 d^8\)
\(H _2 O\) is W.F.L. No pairing
Hence both are paramagnetic.
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