THE JAIN INTERNATIONAL SCHOOL, AURANGABAD
PERIODIC ASSESSMENT – 1 (2022-23)
Grade: XII
Subject: Chemistry
Date: 01.08.2022
Maximum Marks:25
Time allowed: 1 hour
INSTRUCTIONS:
 The question paper has four sections and 12 questions.
 All questions are mandatory
 Section–A has 4 questions of 1 mark each; Section–B has 4 questions of 2 marks
each; Section–C has 3 questions of 3 marks each; and Section–D has 1 question of 4
marks.
 Internal choices have been provided in some questions. A student has to attempt
only one of the alternatives in such questions.
SECTION A
1. 0.1 M solution of urea, at a given temperature, is isotonic with:
a. 0.1 M glucose solution
b. 0.1 M BaCl2 solution
c. 0.1 M NaCl solution
d. 0.02 M KCl solution
2. Amalgam of mercury with sodium is an example of:
a. Solid in liquid
b. Gas in solid
c. Liquid in gas
d. Liquid in solid
3. The sum of all mole fraction for a mixture is always equal to:
a. 0
b. 1
c. 3
d. 2
4. The tanks used by divers are filled with air diluted with:
a. Helium
b. Argon
c. Nitrogen
d. Hydrogen
SECTION B
5. Name two factors on which the vapour pressure of the liquid depends?
6. What are maximum boiling azeotropes? Give one example.
OR
What do you expect to happen when Red Blood Corpuscles (RBC's) are placed in i. 1%
NaCl solution ii. 0.5% NaCl solution.
7. A person suffering from high blood pressure should take less common salt, why?
8. Why is osmotic pressure considered to be a colligative property?
OR
Why is ether not miscible in water?
SECTION C
9. What type of mixtures of two liquids distill over at one temperature and why?
10. Amongst the following compounds, identify which are insoluble, partially soluble and
highly soluble in water?
i. phenol
ii. toluene
iii. formic acid
iv. ethylene glycol
v. chloroform
vi. pentanol.
11. Calculate the molality of a solution containing 20.7 g of potassium carbonate dissolute in
500 ml of solution, assume density of solution = 1 g/ml.
OR
Calculate the mass percentage of benzene (C6H6) and carbon tetrachloride (CCl4) if 22 g of
benzene is dissolved in 122 g of carbon tetrachloride.
SECTION D
12. 100 mg of a protein is dissolved in just enough water to make 10.0 mL of solution. If this
solution has an osmotic pressure of 13.3 mm Hg at 25°C what is the molar mass of the
protein? (R = 0.0821 L at mol-1 K-1 760 mm Hg = 1 atm)
OR
What type of mixtures of two liquids distill over at one temperature and why?