Covalent Bonding in H2,N2,O2

Q.

What is the maximum number of electrons that can be present in the nth shell of the atom.

Q.

The K-shell of an atom can hold a maximum of 32 electrons.

1. True
2. False

Q.

The maximum number of electrons the K shell can hold is_____________.

1. one

2. eight

3. two

4. zero

Q.

Is Bond Breaking Exothermic?

Q. Predict the type of bonding in the calcium oxide. [3 marks]

Q.

Find out the valency and covalency shown by the:

(c) Carbon atom.

Q.

Statement 1: Hydrogen atom just needs 1 extra electron to fill its outer-most orbit.

Statement 2: The first orbit can occupy only 2 electrons.

1. Statement 1 and 2 are correct, but statement 2 is not the correct reason for statement 1.

2. Statement 1 and 2 are correct and statement 2 is the correct reason for statement 1.

3. Statement 1 is correct and statement 2 is incorrect.

4. Statement 2 is correct, but statement 1 is incorrect.

Q. A helium atom has 2 electrons in its valence shell, but it does not have a valency of 2. Justify the statement.
[1 Mark]

Q. Arrange the energy required to break all the bonds in each of the following bond types in descending order.

1. Double bond, single bond, triple bond
2. Triple bond, single bond, double bond
3. All the bonds require equal energy
4. Triple bond, double bond, single bond

Q. Atomic number of nitrogen is 7. What do can we inferred from this?

1. Nitrogen will share 3 electrons to form a diatomic molecule.
2. Both B and C are true
3. Nitrogen will form 2 bonds with another nitrogen atom and attain octet configuration.
4. Nitrogen will share only 2 electrons to form a diatomic molecule

Q. All elements tend to obey octet rule except hydrogen. Why is it so?

1. Because hydrogen can accommodate a maximum of 2 electrons in its valence shell.
2. Because hydrogen is in the gaseous state.
3. Because hydrogen is a metal.
4. The question is wrong. Hydrogen obeys the octet rule.

Q. During the formation of hydrogen molecule, the total number of electrons shared by hydrogen atoms is/are:

1. one
2. two
3. three
4. four

Q.

Which amongst the following is the electron dot structure of $H_2$ molecule?

1. 

2. 

3. 

4. None of the above.

Q. Identify the correct Lewis dot structure of $O_2$ molecule.

1. 

2. 

3. 

4. 

Q.

Which of the following statements are true regarding the oxygen atom?

1. Valence electrons of oxygen are 6 and each oxygen atom will share 2 valence electrons to make a double bond with other oxygen atom.

2. Valence electrons of oxygen are 4 and each oxygen atom will share only 2 valence electrons to make a single bond with another oxygen atom.

3. Valence electrons of oxygen are 4 and each oxygen atom will share only 1 valence electron to make a bond with another oxygen atom.

4. Valence electrons of oxygen are 6 and each oxygen atom will share 2 valence electrons to make a single bond.

Q. How many bonds are formed between two carbon atoms with 4 shared electrons?

1. Three single bonds
2. A double bond
3. A double bond and a single bond
4. A triple bond

Q.

When Hydrogen atoms combine with carbon atoms to form methane, ___ is released.

Q. Find the number of electrons that can be accommodated in K-shell of an atom.

1. 8
2. 2
3. 1
4. 4