Chapter U4, Problem 3STP

Interpretation Introduction

Interpretation:

The physical appearance of the products upon reaction needs to be predicted.

Concept introduction:

The evolution of a gaseous product leads to the formation of gas bubbles in the reaction flask. The bubbles can be easily seen by the naked eye.

Answer to Problem 3STP

Option (A) is the correct answer.

Explanation of Solution

Reason for Correct Option:

The reaction leads to the formation of carbon dioxide, CO₂ gas. CO₂ gas is sparingly soluble in water under normal conditions of temperature and pressure. Hence, CO₂ gas remains in the reaction mixture as gas bubbles.

Conclusion

Reasons for Incorrect Options:

The aqueous species are all colorless. Moreover, since the reactants as well as the product in the given reaction are in aqueous form thus, the species are present in completely soluble form or no precipitate is formed. Also, water is completely colorless and easily dissolves all the aqueous species. Thus, the options (B), (C) and (D) are incorrect.