Class 12 Chemistry · Chapter 2 · Test 2
Complexes and Ligands
40 MCQs This test covers the definitions of complex, ligand and coordination number, the Lewis acid-base explanation, ligand names, and monodentate, bidentate and polydentate ligands.
39 questions · 35 min · 39 marks
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Sample questions
The first 5 of 39. Try each one, then tap to see the answer.
Question 1
Transition elements form complex ions because they have:
- AVacant d orbitals that are energetically accessible
- BCompletely filled d orbitals
- CHigh atomic masses
- DOnly s electrons
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Answer: A
Low-energy empty d orbitals can accept electron pairs from ligands.
Question 2
In a complex ion the bond between a ligand and the central metal is a:
- AIonic bond
- BDative (coordinate) covalent bond
- CMetallic bond
- DHydrogen bond
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Answer: B
The ligand donates a lone pair into a vacant d orbital.
Question 3
A complex is:
- AA mixture of metal ions and water
- BA pure metal lattice
- CA molecule or ion with a central metal atom or ion surrounded by one or more ligands
- DA salt containing only monatomic ions
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Answer: C
This is the textbook definition of a complex.
Question 4
A ligand is a species that:
- AAccepts a lone pair from the metal
- BIs always positively charged
- CIs always a molecule
- DContains a lone pair of electrons and forms a dative bond to a central metal atom or ion
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Answer: D
Ligands are electron pair donors.
Question 5
In complex formation the ligand acts as a:
- ALewis base
- BLewis acid
- CReducing agent only
- DCatalyst
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Answer: A
It donates an electron pair.
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