Q51 of 62 Page 27

Note: In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

Assertion: Molarity of a solution in liquid state changes with temperature.


Reason: The volume of a solution changes with change in temperature.


Molality is temperature independent, but molarity is temperature dependent.

Molality= (Number of moles of the solute components)/(Mass solvent in ki log⁡r ams)


Molality depends on the mass of solvent which remains constant even on increasing temperature. Mass never increases or decreases with temperature.


Molarity=(Number of moles of solute component)/(Volume of solution( in litres))


But molarity, on the other hand, depends on the volume of the solution volume changes when the temperature changes. Therefore, molarity is temperature dependent.

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49

Match the laws given in Column I with expressions given in Column II.

 50

Match the terms given in Column I with expressions given in Column II.

 52

Note: In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

Assertion: When methyl alcohol is added to water, the boiling point of water increases.


Reason: When a volatile solute is added to a volatile solvent elevation in boiling point is observed.


 53

Note: In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

Assertion: When NaCl is added to water a depression in freezing point is observed.


Reason: The lowering of the vapour pressure of a solution causes depression in the freezing point.