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Question

Which one of the following statements is not correct?
  1. Water starts boiling when its vapour pressure becomes equal to atmospheric pressure
  2. Water is know as universal solvent
  3. Permanent hardness of water is due to presence of MgCl2,CaCl2,MgSO and CaSO4.
  4. Density of ice is greater than that of water.

A
Water starts boiling when its vapour pressure becomes equal to atmospheric pressure
B
Water is know as universal solvent
C
Permanent hardness of water is due to presence of MgCl2,CaCl2,MgSO and CaSO4.
D
Density of ice is greater than that of water.
Solution
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Similar Questions
Q1

The water boils when :

1.Saturated vapour pressure of water becomes equal to atmospheric pressure

2. Boiling point of water becomes more than atmospheric pressure

3. Saturated vapour pressure of water is less than atmospheric pressure

4. Vapour pressure of water becomes more than atmospheric pressure

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Q2
Different samples of water contained each 100 ppm of CaCl2,MgSO4,CaSO4 and MgCl2. Among them which will have greater hardness?
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Q3
why it is said that boiling of a liquid occurs at the temperature at which its vapour pressure becomes equal to the atmospheric pressure ?
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Q4
Comprehension # 2
Following passage explains the effect of temperature on the vapour pressure of the liquid.

Effect of temperature on vapour pressure
The quantity of heat required to evaporate a given liquid at constant temperature is defined as the heat of vaporisation. Variation of vapour pressure with temperature is given by,

Clausius-Clapeyron equation.

logeP=ΔHvapRT+logeA

A liquid is said to be at its boiling temperature if its vapour pressure is equal to external pressure. Therefore, the boiling point of water in particular and of liquids in general decreases as an altitude of a place increases where the external pressure is less than 1atmosphere (normal b.p. of water is 373.15K at 1atmosphere)

On top of mount everest, for example, where the atmospheric pressure is only about 260mmHg, water boils at approximately 71C. Conversely, if the external pressure on a liquid is greater than 1atm, the vapour pressure necessary for boiling than normal boiling is reached later, and the liquid boils at a temperature greater than the normal boiling point.

Clausius-Clapeyron equation can be written in the following form:

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Q5
In a closed lab, experiment is conducted by heating of water. When water is heated, the vapour pressure increased slowly then rapidly increases. As the water reaches to its boiling point, i.e. 1000C, the vapour pressure reaches 1 atm. Which of the following functions best describes the increase in vapour pressure as water is heated to its boiling point?
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