Question

Assertion : In a pressure cooker, the water is brought to boil. The cooker is then removed from the stove. Now on removing the lid of pressure cooker, the water starts boiling again.
Reason : The impurities in water bring down its boiling point.

• A. Both the assertion and reason are correct
• B. Assertion is correct but the reason is incorrect
• C. Assertion is incorrect but the reason is correct
• D. Both the assertion and reason are incorrect

Answer 1

The correct option is B Assertion is correct but the reason is incorrect

In pressure cooker, water boils above ${100}^{o}C$. When the lid of cooker is opened, pressure is lowered so that boiling point decreases and water boils again. Impurities generally increase the boiling point.