Question

Which of the following molecules are ionic?

Answer 1

1st one is E
2nd one is also E

Answer 2

Answer:

For A: The correct answer is Option E.

For B: The correct answer is Option E.

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.