Question

Choose the correct option regarding the following assertion and reason.

Assertion: Use of hard water in industrial boilers reduces heating efficiency.
Reason: Hard water produces scales on the inner walls of the boilers.

• A. Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
• B. Both Assertion and Reason are true and Reason is not the correct explanation of Assertion.
• C. Both Assertion and Reason are false
• D. Only Assertion is true.

Answer 1

The correct option is A Both Assertion and Reason are true and Reason is the correct explanation of Assertion.

When hard water is used in industrial boilers, insoluble salts of calcium and magnesium are formed. They get deposited on the walls of the boiler to form scales during the evaporation of water. These scales decrease the thermal conductivity of the boilers causing a significantly lesser heat transfer to the water inside the boilers. Scaling can even lead to explosion of the container.