Question

Consider the following:
Assertion (A) : Density of ice is less than water.
Reason (R) : Density of ice is maximum at 4°C .
Now choose the correct option .
(1) Both (A) and (R) are true and (R) is the correct explanation of (A).
(2) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(3) (A) is true but (R) is false.
(4) (A) is false but (R) is true.​

Answer 1

Answer:

2 is correct as both the ans are correct and r is not the correct explanation of A

Answer 2

Answer:

Correct option is (1)

(1) Both (A) and (R) are true and (R) is the correct explanation of (A).

Assertion (A) : Density of ice is less than water.

Reason (R) : Density of ice is maximum at 4°C .

Explanation:

• Water has a unique property in that it has its maximum density at around 4 degrees Celsius. The density decreases as we go above or below the mark. In addition, ice has a lower density than water.
• Thus, a circulation system is established until the water in the pond reaches its maximum density of 4 degrees Celsius.
• After sufficient thickness of ice is formed it prevents further loss of heat from the bottom layers of water.
• This is why fishes and other aquatic animals and plants can survive in ponds and other water bodies even when the atmospheric temperature reaches or is well below 0 degrees.

Explaination of Incorrect options:-

• Option (2) Both (A) and (R) are true but (R) is not the correct explanation of (A) - is an Incorrect answer as Both A and R are true and R is the correct explaination for A.

• Option (3) (A) is true but (R) is false - is an Incorrect answer as Both A and R are True and R is not False.

• Option (4) (A) is false but (R) is true - is an Incorrect answer as Both A and R are True and A is not False.