Q. An aqueous solution of urea boils at at . Find the freezing temperature of soultion.
Given: and for water are and , respectively.

NTA AbhyasNTA Abhyas 2020Solutions Report Error

Solution:

...... (3)
Depression in freezing point
Elevation in boiling point
Boiling point of water ;

Boiling point of urea in water

Freezing point of water
Freezing point of urea in water

from equation (3),

Freezing point urea in water

Questions from NTA Abhyas 2020

1. Which reaction is suitable for preparing -Chloroacetic acid?

2. A mixture of methane and ethene in a molar ratio of has an average molecular mass of . The mean molar mass when they are mixed in the molar ratio of will be -

Some Basic Concepts of Chemistry

3. For a given reaction, energy of activation for forward reaction is and . A catalyst lowers to . The ratio of energy of activation for reverse reaction before and after addition of catalyst is:

Chemical Kinetics

4. 3 Faradays of electricity was passed through an aqueous solution of iron (II) bromide. The weight of iron metal (at. wt. = 56) deposited at the cathode (in g) is

Electrochemistry

5. Cyclohexene on ozonolysis followed by reaction with zinc dust and water gives compound E and compound E on further treatment with aqueous KOH yields compound F. Then compound F is

Aldehydes Ketones and Carboxylic Acids

Questions from Solutions

1. At , the vapour pressure of pure liquid is of and that of pure liquid is of . If a mixture solution of and boils at and atm pressure, the amount of in the mixture is of

2. The vapour pressure of water at is . If of glucose is added to of water at , the vapour pressure of the resulting solution will be

3. Two liquids and form an ideal solution. At , vapour pressure of the solution containing of and mol of is . At the same temperature, if mol of is further added to this solution, vapour pressure of the solution increases by . Vapour pressure (in ) of and in their pure states will be, respectively

4. In observing the effect of pressure on the solubility of a gas in liquid, which of the following is the most appropriate explanation?

5. A supersaturated solution is a metastable state of solution in which solute concentration

Chemistry Most Viewed Questions

1. If for a certain reaction is at , the value of (in for which the same reaction will be spontaneous at the same temperature is

NEET 2020

2. If of a non-electrolyte solute is dissolved in of n-octane to reduce its vapour pressure to , the molar mass (in of the solute is [Given that molar mass of n-octane is

NEET 2020 Solutions

3. An organic compound contains (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is: [Atomic wt. of is is ]

NEET 2021 Some Basic Concepts of Chemistry

4. At standard conditions, if the change in the enthalpy for the following reaction is Given that bond energy of and is and , respectively, what is the bond energy (in of ?