Question

Which of the following molecules are ionic?

A. RbNO3
B. Na2SO4
C. MgCl2
D. NaI
E. All of the above


Which of the following molecules are covalent?
A. SO2
B. C2H2O
C. NO2
D. SiO2
E. All of the above

Answer 1

1st one is E
2nd one is also E

Answer 2

For A: The correct answer is Option E.

For B: The correct answer is Option E.

Step-by-step explanation:

• For A:

Ionic compound is defined as the compound which is formed by complete transfer of electrons from one atom to another atom.

This bond is usually formed between a metal and a non-metal or a metal reacts with a polyatomic ion or a reaction between two polyatomic ions takes place.

For the given options:

Option A:
`RbNO_3`

This compound is formed by the combination of
`Rb^+\text{ and }NO_3^-` ions. Rubidium is a metal and nitrate is a polyatomic ion

Hence, it is an ionic compound.

Option B:
`Na_2SO_4`

This compound is formed by the combination of
`Na^+\text{ and }SO_4^(2-)` ions. Sodium is a metal and sulfate is a polyatomic ion

Hence, it is an ionic compound.

Option C:
`MgCl_2`

This compound is formed by the combination of
`Mg^(2+)\text{ and }Cl^-` ions. Magnesium is a metal and chlorine is a non-metal

Hence, it is an ionic compound.

Option D:
`NaI`

This compound is formed by the combination of
`Na^+\text{ and }I^-` ions. Sodium is a metal and iodine is a non-metal

Hence, it is an ionic compound.

Thus, the correct answer is Option E.

• For B:

Covalent compound is defined as the compound which is formed when sharing of electrons takes place between the atoms. This is usually formed between two non-metals.

Option A:
`SO_2`

This compound is formed by the combination of sulfur and oxygen atoms. Both are non-metals.

Hence, it is a covalent compound.

Option B:
`C_2H_2O`

This compound is formed by the combination of carbon, hydrogen and oxygen atoms. All are non-metals.

Hence, it is a covalent compound.

Option C:
`NO_2`

This compound is formed by the combination of nitrogen and oxygen atoms. Both are non-metals.

Hence, it is a covalent compound.

Option D:
`SiO_2`

This compound is formed by the combination of silicon and oxygen atoms. Both are non-metals.

Hence, it is a covalent compound.

Thus, the correct answer is Option E.