Question

Assertion (A): On opening a Pepsi bottle, CO₂ comes out with fizzing sound.

Reason (R): Solubility of a gas is inversely proportional to pressure.

• A. Both A and R are true and R is the correct explanation of A..
• B. Both A and R are true, but R is not the correct explanation of A.
• C. A is true and R is false.
• D. A is false and R is true.

Answer 1

The correct option is C

A is true and R is false.

The explanation for the correct option:

1. Assertion (A): A is TRUE as on opening a Pepsi bottle, carbon dioxide dissolved in Pepsi suddenly comes out as a fizz.
2. On opening the bottle, there is a sudden decrease in the pressure above the drink and thus the dissolved carbon dioxide becomes less soluble resulting in fast release of CO₂ with a fizzing sound.
3. Reason (R): R is also FALSE because solubility increases with an increase in pressure and vice-versa. Thus, solubility is directly proportional to the pressure.

Conclusion: The correct option is c).