11th Chemistry Weekly Test - 4 ( Solutions )

MABS Institution

11th Chemistry Weekly Test - 4 ( Solutions )-Aug 2020

Time : 1.30 Hours

Part - A

Generic 3 - Answer All Question

Calculate the mass of urea (NH₂CONH₂) required in making 2.5 kg of 0.25 molal aqueous solution.

Explain the factors when i=1,i < 1 and i >1?

A sample of drinking water was found to be severely contaminated with chloroform
(CHCI₃) supposed to be a carcinogen. The level of contamination was 15 ppm (by mass)
(I) express this in percentage by mass
(it) determine the molality of chloroform in the water sample.

Define the following terms.
(i) Boiling point
(ii) Elevation of boiling point
(iii) Ebullioscopic constant

The Henry's Law constant for oxygen dissolved in water is 4.34x104 atm/(mol/L)at 25° C. If the partial pressure of oxygen in air is 0.2 atm under ordinary atmospheric condition, calculate the concentration (in mol/litre) of dissolved oxygen in water equilibrium with air at 25°C

Calculate the amount of benzoic acid (C₆H₅COOH) required for preparing 250 mL of 0.15 Msolution in methanol.

Discuss the types of solutions with suitable examples.

Define the term osmotic pressure. Describe how the molecular mass of a substance can be determined by a method based on measurement of osmotic pressure?

How does the change in temperature, pressure, and concentration causes deviation from ideal behaviour?

Explain the effect of temperature gaseous solute in liquid solvent.

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11th Chemistry Weekly Test - 4 ( Solutions )

MABS Institution

11th Chemistry Weekly Test - 4 ( Solutions )-Aug 2020

Part - A

Generic 3 - Answer All Question

Calculate the mass of urea (NH2CONH2) required in making 2.5 kg of 0.25 molal aqueous solution.

Explain the factors when i=1,i < 1 and i >1?

A sample of drinking water was found to be severely contaminated with chloroform (CHCI3) supposed to be a carcinogen. The level of contamination was 15 ppm (by mass) (I) express this in percentage by mass (it) determine the molality of chloroform in the water sample.

Define the following terms. (i) Boiling point (ii) Elevation of boiling point (iii) Ebullioscopic constant

The Henry's Law constant for oxygen dissolved in water is 4.34x104 atm/(mol/L)at 25° C. If the partial pressure of oxygen in air is 0.2 atm under ordinary atmospheric condition, calculate the concentration (in mol/litre) of dissolved oxygen in water equilibrium with air at 25°C

Calculate the amount of benzoic acid (C6H5COOH) required for preparing 250 mL of 0.15 Msolution in methanol.

Discuss the types of solutions with suitable examples.

Define the term osmotic pressure. Describe how the molecular mass of a substance can be determined by a method based on measurement of osmotic pressure?

How does the change in temperature, pressure, and concentration causes deviation from ideal behaviour?

Explain the effect of temperature gaseous solute in liquid solvent.

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Calculate the mass of urea (NH₂CONH₂) required in making 2.5 kg of 0.25 molal aqueous solution.

A sample of drinking water was found to be severely contaminated with chloroform
(CHCI₃) supposed to be a carcinogen. The level of contamination was 15 ppm (by mass)
(I) express this in percentage by mass
(it) determine the molality of chloroform in the water sample.

Define the following terms.
(i) Boiling point
(ii) Elevation of boiling point
(iii) Ebullioscopic constant

Calculate the amount of benzoic acid (C₆H₅COOH) required for preparing 250 mL of 0.15 Msolution in methanol.