Assertion (A): The density of water decreases when it is cooled from 4 °C to 0 °C.
Reason (R): Volume of water increases in cooling from 4 °C to 0 °C.
Both A and R are true and R is the correct explanation of A
Both A and R are true and R is not the correct explanation of A
Assertion is false but reason is true
Assertion is true but reason is false

Question

Assertion (A): The density of water decreases when it is cooled from 4 °C to 0 °C.

Reason (R): Volume of water increases in cooling from 4 °C to 0 °C.

Both A and R are true and R is the correct explanation of A
Both A and R are true and R is not the correct explanation of A
Assertion is false but reason is true
Assertion is true but reason is false

KnowledgeBoat · Accepted Answer

Both A and R are true and R is the correct explanation of A

Explanation

Assertion (A) is true because when water is cooled from 4 °C to 0 °C, its density decreases instead of increasing as water shows anomalous expansion in this temperature range.

Reason (R) is true because as water cools from 4 °C to 0 °C, its volume increases even though the temperature is decreasing.

Since

$\text {Density} = \dfrac{\text {Mass}}{\text {Volume}}$

So, an increase in volume (with mass constant) leads to a decrease in density.

Therefore, both A and R are true and R is the correct explanation of A.

Physics

Measurements

Answer

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