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Coordination Compounds

Question
CBSEENCH12011124
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Which of the following paramagnetic?

  • CO

  • O2-

  • CN-

  • NO+

Solution

B.

O2-

CO space left parenthesis 6 plus 8 equals 14 right parenthesis space equals space straight sigma 1 straight s squared comma space straight sigma asterisk times 1 straight s squared comma space straight sigma 2 straight s squared comma straight sigma asterisk times 2 straight s squared comma space straight pi 2 straight p subscript straight x superscript 2 space equals straight pi 2 straight p subscript straight y superscript 2 comma space straight sigma 2 straight p subscript straight Z superscript 2 space All space the space electrons space are space paired space so space it space is space diamagnetic. straight O subscript 2 superscript minus space left parenthesis 8 plus 8 plus 1 equals 17 right parenthesis straight sigma 1 straight s squared comma space straight sigma asterisk times 1 straight s squared comma space straight sigma 2 straight s squared comma straight sigma asterisk times 2 straight s squared comma space straight sigma 2 straight p subscript straight z superscript 2 space straight pi 2 straight p subscript straight x superscript 2 space equals straight pi 2 straight p subscript straight y superscript 2 comma space straight pi asterisk times 2 straight p subscript straight x superscript 2 comma space straight pi asterisk times 2 straight p subscript straight y superscript 1 comma It space contains space one space unpaired space electron space so space it space is space paramagetic. CN to the power of minus space left parenthesis 6 plus 7 plus 1 right parenthesis space equals space 14 space equals straight sigma 1 straight s squared comma space straight sigma asterisk times 1 straight s squared comma space straight sigma 2 straight s squared comma straight sigma asterisk times 2 straight s squared comma space straight pi 2 straight p subscript straight x superscript 2 space equals straight pi 2 straight p subscript straight y superscript 2 comma space straight sigma 2 straight p subscript straight Z superscript 2 space NO to the power of plus space left parenthesis 7 plus 8 minus 1 right parenthesis space equals space 14 space equals straight sigma 1 straight s squared comma space straight sigma asterisk times 1 straight s squared comma space straight sigma 2 straight s squared comma straight sigma asterisk times 2 straight s squared comma space straight pi 2 straight p subscript straight x superscript 2 space equals straight pi 2 straight p subscript straight y superscript 2 comma space straight sigma 2 straight p subscript straight Z superscript 2
Thus, among the given species only O2- is paramagnetic. 

Some More Questions From Coordination Compounds Chapter

Write the formula for the following coordination compound:
Dichloridobis(ethane-1, 2-diamine)platinum(lV) nitrate.

Write the formula for the following coordination compound:
Iron(III) hexacyanidoferrate(II)

Write the IUPAC names of the following coordination compounds:
(i) [Co(NH3)6]Cl3
(ii) [Co(NH3)5Cl]Cl2
(iii) K3[Fe(CN)6]
(iv) K3[Fe(C2O4)3]
(v) K2[PdCl4]
(vi) [Pt(NH3)2Cl(NH2CH3)]Cl.

Indicate the type of isomerism exhibited by the following complexes and draw structures for these isomers:
(i)    K[Cr(H2O)2(C2O4)2],                      (ii) [Co(en)3Cl3,
(iii) [Co(NH3)5(NO2)]|NO3]2,                 (iv) [Pt(NH3)(H2O)Cl2]

Explain on the basis of valence bond theory that [Ni(CN)4]2–  ion with square planar is diamagnetic and the [NiCl4]2– ion with tetrahedral geometry is paramagnetic.

Predict the number of unpaired electrons in the square planar [Pt(CN)4,]2– ion.

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