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Assertion (A): The increasing pressure o...

Assertion (A): The increasing pressure on water decreases its freezing point.
Reason (R ):The density of water is maximum at `273 K`.

A

If the both assertion and reason are true and the reason is the correct explanation of the assertion

B

If both assertion and reason are true and the reason is not the correct explanation of the assertion

C

If assertion is true but reason is false

D

If both assertion and reason are false statements.

Text Solution

Verified by Experts

The correct Answer is:
B
According to Clapeyron-Clausius equation,
`(dT)/(dP) = (T(V_l-V_s))/(DeltaH_f)`
Since density of ice less than that of water , `V_s` is greater than `V_l`. In other words, the expression on the right hand side of the above equation is negative. This means that the increase of pressure must lower and decrease of pressure must raise the freezing point.
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Each question contains STATEMENT-I(Assertion) and STATEMENT-2(Reason).the statement carefully and mark the correct answer accoring to the instrution given below: STATEMENT - 1 : Increasing pessure on pure water decrease its freezing point. STATEMENT - 2 : Density of water is maximum at 273 K.

Assertion (A) When NaCl is added to water a depression in freezing point is observed. Reason (R ) The lowering of vapour pressure of a solution causes depression in the freezing point.

Assertion: Ice is lighter than water and floats on it. Reason : The density of water is maximum at 4^(@) C and lower at greater and lower temperatures.

The melting of ice in water decreases with increase in pressure.

Soluble impurities present in water increase the freezing point of water. True of False?

The freezing point of water decreases with a decrease in pressure . True or False

Assertion : The melting point of ice decreases with increase of pressure Reason : Ice contract on melting.

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