MCQs on Coordinate or Dative Bonding

A bond formed by sharing a pair of electrons provided, both electrons are by one of the two bonded atoms is called a dative bond or a coordinate covalent bond. The atom providing two electrons to form a dative bond is called a donor and the atom sharing the pair of electrons from a donor is known as an acceptor. A dative bond may be represented with an arrow from the donor to the acceptor as A–> B with a positive charge on the donor and negative charge on the acceptor. The donor should have at least one lone pair of electrons and acceptor should have a vacant orbital. Coordinate covalent compounds are nonelectrolytes that do not conduct electricity because they do not ionise in water.

1. When two species A and B form an electron-pair bond and A does not provide its electrons for bonding, the bond present between A and B must be

1. ionic
2. covalent
3. dative
4. Hydrogen

Answer: (c)

2. Each of the following pairs of chemical species will combine. Which of the following combinations is best explained by the coordinate covalent bond?

1. H₂ + I₂
2. Mg +O₂
3. Cl + Cl
4. H⁺ + H₂O

Answer: (d)

3. BF₃ forms an adduct with NH₃ because

1. nitrogen has a high electronegativity
2. boron has a high electronegativity
3. boron has an empty p-orbital and nitrogen has one lone pair of electrons
4. boron has an electropositive character

Answer: (c)

4. Protons play an important role in which type of bonding?

1. electrovalent
2. hydrogen
3. covalent
4. coordinate

Answer: (d)

5. Which of the following compounds contain all three types: ionic, covalent and dative bonds?

1. CuSO₄.5H₂O
2. Solid N₂O₅
3. (NH₄)₂SO₄
4. All

Answer: (d)

6. The type of bond formed during the hydration of cation is

1. ionic
2. covalent
3. electrostatic
4. dative bond

Answer: (d)

7. Which of the following compounds has electrovalent linkage?

1. CH₃Cl
2. NaCl
3. CH₄
4. Cl₂

Answer: (b)

8. Which of the following bonds has the most polar character?

1. C-O
2. C-Br
3. C-S
4. C-F

Answer: (d)

9. A molecule with multiple covalent bonds is

1. C₂H₄
2. H₂
3. F₂
4. N₂

Answer: (d)

10. The weakest bond is

1. Hydrogen
2. Van der Waals
3. Covalent
4. Coordinate

Answer: (b)

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