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COORDINATION COMPOUNDS

28866 Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour?

1

[N i (N H_{3})_{6}]^{2 +}

2

[Z n (N H_{3})_{6}]^{2 +}

3

[C r (N H_{3})_{6}]^{3 +}

4

[C o (N H_{3})_{6}]^{3 +}

Explanation:

${[Ni {({NH}_{3})}_{6}]}^{2 +} : {sp}^{3} d^{2}$ (outer), octahedral, paramagnetic
${[Zn {({NH}_{3})}_{6}]}^{2 +} : {sp}^{3} d^{2}$ (outer), octahedral, diamagnetic
${[Cr {({NH}_{3})}_{6}]}^{3 +} : d^{2} {sp}^{3}$ (inner), octahedral, paramagnetic
${[Co {({NH}_{3})}_{6}]}^{3 +} : d^{2} {sp}^{3}$ (inner). octahedral, diamagnetic

COORDINATION COMPOUNDS

28867 Red precipitate is obtained when ethanol solution of dimethylglyoxime is added to ammoniacal $N i (I I) .$ Which of the following statements is not true?

1 Red complex has a square planar geometry.

2 Complex has symmetrical

H -

bonding.

3 Red complex has a tetrahedral geometry.

4 Dimethylglyoxime functions as bidentate ligand.

Explanation:

The Dimethlyglyoxime ligand form Red coloured square planer complex with $N i^{2 +} .$ This complex is stabilised due to $H -$ bond.

COORDINATION COMPOUNDS

28868 Low spin complex of $d^{6} -$ cation in an octahedral field will have the following energy( $Δ_{o} =$ crystal field splitting energy in an octahedral field, $P =$ Electron pairing energy)

1

\frac{- 12}{5} Δ_{o} + P

2

\frac{- 12}{5} Δ_{o} + 3 P

3

\frac{- 2}{5} Δ_{o} + 2 P

4

\frac{- 2}{5} Δ_{o} + P

Explanation:

Low spin complex of $d^{6}$ cation having $Δ_{0} > P . E$
Configuration is $t_{2} g^{6} e g^{0}$ and 3 electron are paired in $t_{2 g}$ orbital
$= \frac{- 2}{5} Δ_{0} \times 6 + 3 P$
$= \frac{- 12}{5} Δ_{0} + 3 P$ 345-s470

COORDINATION COMPOUNDS

28869 Of the following complex ions, which is diamagnetic in nature?

1

[N i C l_{4}]^{2 -}

2

[N i (C N)_{4}]^{2 -}

3

[C u C l_{4}]^{2 -}

4

[C o F_{6}]^{3 -}

Explanation:

Electronic configuration of $N i^{2 +} i n {[N i (C N)_{4}]}^{2 -}$ is $N i^{2 +} = 3 d^{8} 4 s^{0}$
$∴ {[N i (C N)_{4}]}^{2 -}$ is diamagnetic (because of the absence of unpaired electrons).

COORDINATION COMPOUNDS

28866 Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour?

1

[N i (N H_{3})_{6}]^{2 +}

2

[Z n (N H_{3})_{6}]^{2 +}

3

[C r (N H_{3})_{6}]^{3 +}

4

[C o (N H_{3})_{6}]^{3 +}

Explanation:

${[Ni {({NH}_{3})}_{6}]}^{2 +} : {sp}^{3} d^{2}$ (outer), octahedral, paramagnetic
${[Zn {({NH}_{3})}_{6}]}^{2 +} : {sp}^{3} d^{2}$ (outer), octahedral, diamagnetic
${[Cr {({NH}_{3})}_{6}]}^{3 +} : d^{2} {sp}^{3}$ (inner), octahedral, paramagnetic
${[Co {({NH}_{3})}_{6}]}^{3 +} : d^{2} {sp}^{3}$ (inner). octahedral, diamagnetic

COORDINATION COMPOUNDS

28867 Red precipitate is obtained when ethanol solution of dimethylglyoxime is added to ammoniacal $N i (I I) .$ Which of the following statements is not true?

1 Red complex has a square planar geometry.

2 Complex has symmetrical

H -

bonding.

3 Red complex has a tetrahedral geometry.

4 Dimethylglyoxime functions as bidentate ligand.

Explanation:

The Dimethlyglyoxime ligand form Red coloured square planer complex with $N i^{2 +} .$ This complex is stabilised due to $H -$ bond.

COORDINATION COMPOUNDS

28868 Low spin complex of $d^{6} -$ cation in an octahedral field will have the following energy( $Δ_{o} =$ crystal field splitting energy in an octahedral field, $P =$ Electron pairing energy)

1

\frac{- 12}{5} Δ_{o} + P

2

\frac{- 12}{5} Δ_{o} + 3 P

3

\frac{- 2}{5} Δ_{o} + 2 P

4

\frac{- 2}{5} Δ_{o} + P

Explanation:

Low spin complex of $d^{6}$ cation having $Δ_{0} > P . E$
Configuration is $t_{2} g^{6} e g^{0}$ and 3 electron are paired in $t_{2 g}$ orbital
$= \frac{- 2}{5} Δ_{0} \times 6 + 3 P$
$= \frac{- 12}{5} Δ_{0} + 3 P$ 345-s470

COORDINATION COMPOUNDS

28869 Of the following complex ions, which is diamagnetic in nature?

1

[N i C l_{4}]^{2 -}

2

[N i (C N)_{4}]^{2 -}

3

[C u C l_{4}]^{2 -}

4

[C o F_{6}]^{3 -}

Explanation:

Electronic configuration of $N i^{2 +} i n {[N i (C N)_{4}]}^{2 -}$ is $N i^{2 +} = 3 d^{8} 4 s^{0}$
$∴ {[N i (C N)_{4}]}^{2 -}$ is diamagnetic (because of the absence of unpaired electrons).

COORDINATION COMPOUNDS

28866 Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour?

1

[N i (N H_{3})_{6}]^{2 +}

2

[Z n (N H_{3})_{6}]^{2 +}

3

[C r (N H_{3})_{6}]^{3 +}

4

[C o (N H_{3})_{6}]^{3 +}

Explanation:

${[Ni {({NH}_{3})}_{6}]}^{2 +} : {sp}^{3} d^{2}$ (outer), octahedral, paramagnetic
${[Zn {({NH}_{3})}_{6}]}^{2 +} : {sp}^{3} d^{2}$ (outer), octahedral, diamagnetic
${[Cr {({NH}_{3})}_{6}]}^{3 +} : d^{2} {sp}^{3}$ (inner), octahedral, paramagnetic
${[Co {({NH}_{3})}_{6}]}^{3 +} : d^{2} {sp}^{3}$ (inner). octahedral, diamagnetic

COORDINATION COMPOUNDS

28867 Red precipitate is obtained when ethanol solution of dimethylglyoxime is added to ammoniacal $N i (I I) .$ Which of the following statements is not true?

1 Red complex has a square planar geometry.

2 Complex has symmetrical

H -

bonding.

3 Red complex has a tetrahedral geometry.

4 Dimethylglyoxime functions as bidentate ligand.

Explanation:

The Dimethlyglyoxime ligand form Red coloured square planer complex with $N i^{2 +} .$ This complex is stabilised due to $H -$ bond.

COORDINATION COMPOUNDS

28868 Low spin complex of $d^{6} -$ cation in an octahedral field will have the following energy( $Δ_{o} =$ crystal field splitting energy in an octahedral field, $P =$ Electron pairing energy)

1

\frac{- 12}{5} Δ_{o} + P

2

\frac{- 12}{5} Δ_{o} + 3 P

3

\frac{- 2}{5} Δ_{o} + 2 P

4

\frac{- 2}{5} Δ_{o} + P

Explanation:

Low spin complex of $d^{6}$ cation having $Δ_{0} > P . E$
Configuration is $t_{2} g^{6} e g^{0}$ and 3 electron are paired in $t_{2 g}$ orbital
$= \frac{- 2}{5} Δ_{0} \times 6 + 3 P$
$= \frac{- 12}{5} Δ_{0} + 3 P$ 345-s470

COORDINATION COMPOUNDS

28869 Of the following complex ions, which is diamagnetic in nature?

1

[N i C l_{4}]^{2 -}

2

[N i (C N)_{4}]^{2 -}

3

[C u C l_{4}]^{2 -}

4

[C o F_{6}]^{3 -}

Explanation:

Electronic configuration of $N i^{2 +} i n {[N i (C N)_{4}]}^{2 -}$ is $N i^{2 +} = 3 d^{8} 4 s^{0}$
$∴ {[N i (C N)_{4}]}^{2 -}$ is diamagnetic (because of the absence of unpaired electrons).

COORDINATION COMPOUNDS

28866 Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour?

1

[N i (N H_{3})_{6}]^{2 +}

2

[Z n (N H_{3})_{6}]^{2 +}

3

[C r (N H_{3})_{6}]^{3 +}

4

[C o (N H_{3})_{6}]^{3 +}

Explanation:

${[Ni {({NH}_{3})}_{6}]}^{2 +} : {sp}^{3} d^{2}$ (outer), octahedral, paramagnetic
${[Zn {({NH}_{3})}_{6}]}^{2 +} : {sp}^{3} d^{2}$ (outer), octahedral, diamagnetic
${[Cr {({NH}_{3})}_{6}]}^{3 +} : d^{2} {sp}^{3}$ (inner), octahedral, paramagnetic
${[Co {({NH}_{3})}_{6}]}^{3 +} : d^{2} {sp}^{3}$ (inner). octahedral, diamagnetic

COORDINATION COMPOUNDS

28867 Red precipitate is obtained when ethanol solution of dimethylglyoxime is added to ammoniacal $N i (I I) .$ Which of the following statements is not true?

1 Red complex has a square planar geometry.

2 Complex has symmetrical

H -

bonding.

3 Red complex has a tetrahedral geometry.

4 Dimethylglyoxime functions as bidentate ligand.

Explanation:

The Dimethlyglyoxime ligand form Red coloured square planer complex with $N i^{2 +} .$ This complex is stabilised due to $H -$ bond.

COORDINATION COMPOUNDS

28868 Low spin complex of $d^{6} -$ cation in an octahedral field will have the following energy( $Δ_{o} =$ crystal field splitting energy in an octahedral field, $P =$ Electron pairing energy)

1

\frac{- 12}{5} Δ_{o} + P

2

\frac{- 12}{5} Δ_{o} + 3 P

3

\frac{- 2}{5} Δ_{o} + 2 P

4

\frac{- 2}{5} Δ_{o} + P

Explanation:

Low spin complex of $d^{6}$ cation having $Δ_{0} > P . E$
Configuration is $t_{2} g^{6} e g^{0}$ and 3 electron are paired in $t_{2 g}$ orbital
$= \frac{- 2}{5} Δ_{0} \times 6 + 3 P$
$= \frac{- 12}{5} Δ_{0} + 3 P$ 345-s470

COORDINATION COMPOUNDS

28869 Of the following complex ions, which is diamagnetic in nature?

1

[N i C l_{4}]^{2 -}

2

[N i (C N)_{4}]^{2 -}

3

[C u C l_{4}]^{2 -}

4

[C o F_{6}]^{3 -}

Explanation:

Electronic configuration of $N i^{2 +} i n {[N i (C N)_{4}]}^{2 -}$ is $N i^{2 +} = 3 d^{8} 4 s^{0}$
$∴ {[N i (C N)_{4}]}^{2 -}$ is diamagnetic (because of the absence of unpaired electrons).