Chapter U2, Problem 2STP

Interpretation Introduction

Interpretation:

The compounds having covalent molecules, needs to be identified.

Concept introduction:

A covalent bond is a chemical bond in which sharing of electron pairs takes place between the atoms.

Answer to Problem 2STP

Correct options:

(B) (C) and (D) all are correct.

Explanation of Solution

Reason for correct options:

The formula of sodium carbonate is Na₂CO₃. It exits as $2{\text{Na}}^{+}$ and ${\text{CO}}_3^{2-}$ ions. Thus, it is an ionic compound. But, here carbonate ion contains covalent bonds. Thus, it contains covalent molecule.

C(CH₃)₄ is covalent in nature. Because these compounds contain carbon as a main constituent and the valency of carbon is 4 and it always forms covalent bond. Also, CH₂BrF contains non-metals and the compound is formed after sharing of electrons thus, it is a covalent compound.

Conclusion

Reason for incorrect option/s:

The ammonium acetate is represented as ${\text{NH}}_{\text{4}}{\text{CH}}_{\text{3}}{\text{CO}}_{\text{2}}$. It exist as ${\text{NH}}_4{}^{+}$ and ${\text{CH}}_{\text{3}}{\text{COO}}^{-}$ ions. Thus, it is an ionic compound.