MCQs on Bond Energy

A bond is a force holding atoms together. When atoms come together to form compounds and molecules, the atoms acquire a more stable electronic configuration. The more stable electron configuration means that the chemical potential energy of the system is lowered and energy is released. To decompose a compound, energy must be supplied to break the chemical bond(s) holding the atoms together. The energy necessary to break a chemical bond is referred to as the bond energy. Bond energy is measured in kilojoules per mole of bonds. Any change in atomic charge is perfectly counteracted by appropriate changes in internuclear distances in order to prevent changes of bond energy.

1. Which bond is most polar?

1. N-F
2. C-O
3. O-F
4. C-F

Answer: (d)

2. On the basis of octet rule, which bond is not present in gaseous nitrogen pentoxide molecule?

1. covalent bonds
2. coordinate bond
3. electrovalent bond
4. both electrovalent and coordinate bonds

Answer: (c)

3. Back pi donation exist in

1. NF₃
2. NH₃
3. BF₃
4. BF₄^–

Answer: (c)

4. What is correct about bond order?

1. it always has an integral value
2. it can have any value positive, integral or fraction including zero
3. it can have any value greater than zero
4. all the above statements are correct

Answer: (b)

5. In which of the following molecules, the bond lengths around the central atom are not equal?

1. SF₆
2. PF₅
3. PCl₃
4. BF₃

Answer: (b)

6. Which one among the following has the highest bond order according to MO theory?

1. BN
2. CO
3. F₂
4. Ne₂

Answer: (b)

7. The weak forces between molecules are called

1. molecular forces
2. intermolecular forces
3. intramolecular forces
4. extramolecular forces

Answer: (b)

8. Bond energy refers to the

1. energy required to make a mole of a compound
2. energy required to break a mole of a compound
3. energy required to carry out sublimation
4. none of the above

Answer: (b)

9. In O-C-O the bond angle is

1. 180^o
2. 87.5^o
3. 120^o
4. 109.5^o

Answer: (a)

10. The energy which is required to break 1 mole of a given bond is called

1. bond energy
2. molar energy
3. molar bond energy
4. bond breaking energy

Answer: (a)

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