Transition Elements MCQs Question and Answer in Engineering Chemistry

1.
The separation of trivalent lanthanide ions, Lu³⁺, Yb³⁺, Dy³⁺, Eu³⁺ can, be effectively done by a cation exchange resin using ammonium o-hydroxy iso-butyrate as the eluent. The order in which the ions will be separated is

A. Lu³⁺, Yb³⁺, Dy³⁺, Eu³⁺

B. Eu³⁺, Dy³⁺, Yb³⁺, Lu³⁺

C. Dy³⁺, Yb³⁺, Eu³⁺, Lu³⁺

D. Yb³⁺, Dy³⁺, Lu³⁺ , Eu³⁺

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2.
[CoCl₄]^2- is a blue coloured complex. Controlled-treatment of this complex with water generates two isomeric light pink coloured complexes of composition [Ca(H₂O)₄Cl₂]. Identify the correct point groups far [CoCl₄]^2- and two isomeric complexes [CO(H₂O)₄Cl₂].

A. D_4h and (C_2v and C_2h)

B. T_d and (C_2v and D_4h)

C. D_4h and (C_2v and D_4h)

D. T_d and (C_2v and C_4v)

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3.
The complex that exists as a pair of enantiomers is

A. trans-[CO(H₂NCH₂CH₂NH₂)₂Cl₂]⁺

B. cis-[Co(NH₃)₄Cl₂]⁺

C. [Pt(PPh₃)(Cl)(Br)(CH₃)]^-

D. [Co(H₂NCH₂CH₂NH₂)₃]³⁺

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4.
The complex formed in the brown ring test for nitrates is

A. [Fe(H₂O)₅NO]³⁺

B. [Fe(H₂O)₅NO]²⁺

C. [Fe(H₂O)₄(NO)]²⁺

D. [Fe(H₂O)₄(NO)]³⁺

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5.
The ligand field bands of lanthanide complexes are generally sharper than those of transition metal complexes because

A. transitions are allowed for lanthanide complexes

B. intensity of the bands are higher for lanthanide complexes

C. f-orbital have higher energy than d-orbital

D. f-orbital, compared to d-orbital interact less effectively with ligand

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6.
The total number of metal-metal bonds in Ru₃(CO)₁₂ and Co₄(CO)₁₂ respectively is

A. 3 and 6

B. 4 and 5

C. zero and 4

D. 3 and 4

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7.
The difference in the measured and calculated magnetic moment (based on spin-orbit coupling) is observed for

A. Pm³⁺

B. Eu³⁺

C. Dy³⁺

D. Lu³⁺

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8.
The comlexes [Co(NH₃)₄(H₂O)Cl]Br₂ and [Co(NH₃)Br₂]Cl $$ \cdot $$ H₂O are examples of

A. ionization isomerism

B. linkage isomerism

C. geometrical isomerism

D. optical isomerism

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9.
The compound which obeys 18-electron rule is

A. Mn(CO)₃

B. Fe(CO)₄

C. V(CO)₆

D. Cr(CO)₆

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10.
The correct statement regarding the thermodynamic stability and kinetic reactivity of metal ion complexes is that

A. more stable complexes are less reactive

B. there exists a dependence on the bulkiness of the ligand

C. there exists no direct relation between these two phenomenon

D. there exists a dependence on the size of the metal ion

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Transition Elements MCQs Question and Answer in Engineering Chemistry

1. The separation of trivalent lanthanide ions, Lu3+, Yb3+, Dy3+, Eu3+ can, be effectively done by a cation exchange resin using ammonium o-hydroxy iso-butyrate as the eluent. The order in which the ions will be separated is

Answer & Solution

2. [CoCl4]2- is a blue coloured complex. Controlled-treatment of this complex with water generates two isomeric light pink coloured complexes of composition [Ca(H2O)4Cl2]. Identify the correct point groups far [CoCl4]2- and two isomeric complexes [CO(H2O)4Cl2].

Answer & Solution

3. The complex that exists as a pair of enantiomers is

Answer & Solution

4. The complex formed in the brown ring test for nitrates is

Answer & Solution

5. The ligand field bands of lanthanide complexes are generally sharper than those of transition metal complexes because

Answer & Solution

6. The total number of metal-metal bonds in Ru3(CO)12 and Co4(CO)12 respectively is

Answer & Solution

7. The difference in the measured and calculated magnetic moment (based on spin-orbit coupling) is observed for

Answer & Solution

8. The comlexes [Co(NH3)4(H2O)Cl]Br2 and [Co(NH3)Br2]Cl $$ \cdot $$ H2O are examples of

Answer & Solution

9. The compound which obeys 18-electron rule is

Answer & Solution

10. The correct statement regarding the thermodynamic stability and kinetic reactivity of metal ion complexes is that

Answer & Solution

1.
The separation of trivalent lanthanide ions, Lu³⁺, Yb³⁺, Dy³⁺, Eu³⁺ can, be effectively done by a cation exchange resin using ammonium o-hydroxy iso-butyrate as the eluent. The order in which the ions will be separated is

2.
[CoCl₄]^2- is a blue coloured complex. Controlled-treatment of this complex with water generates two isomeric light pink coloured complexes of composition [Ca(H₂O)₄Cl₂]. Identify the correct point groups far [CoCl₄]^2- and two isomeric complexes [CO(H₂O)₄Cl₂].

3.
The complex that exists as a pair of enantiomers is

4.
The complex formed in the brown ring test for nitrates is

5.
The ligand field bands of lanthanide complexes are generally sharper than those of transition metal complexes because

6.
The total number of metal-metal bonds in Ru₃(CO)₁₂ and Co₄(CO)₁₂ respectively is

7.
The difference in the measured and calculated magnetic moment (based on spin-orbit coupling) is observed for

8.
The comlexes [Co(NH₃)₄(H₂O)Cl]Br₂ and [Co(NH₃)Br₂]Cl $$ \cdot $$ H₂O are examples of

9.
The compound which obeys 18-electron rule is

10.
The correct statement regarding the thermodynamic stability and kinetic reactivity of metal ion complexes is that