Solutions Chapter – 20 Most Repeated JEE Previous Year Questions (PYQs) | Class 12 Chemistry

Class 12 Chemistry
Important MCQs • Solutions Chapter • Attractive Revision Notes



Q1. A 1% solution of solute X is isotonic with a 6% solution of sucrose (Molar mass = 342 g
mol■¹). The molar mass of solute X is:


<b>A.</b>
34.2 g mol■¹

<b>B.</b>
57 g mol■¹

<b>C.</b>
114 g mol■¹

<b>D.</b>
3.42 g mol■¹


Q2. Low concentration of oxygen in the blood and tissues of people living at high altitude is due
to:


<b>A.</b>
Low temperature

<b>B.</b>
Low atmospheric pressure

<b>C.</b>
High atmospheric pressure

<b>D.</b>
High temperature


Q3. Which of the following solutions would have the highest osmotic pressure?


<b>A.</b>
M/10 NaCl

<b>B.</b>
M/10 Urea

<b>C.</b>
M/10 BaCl■

<b>D.</b>
M/10 Glucose


Q4. For an electrolyte undergoing association in a solvent, the van’t Hoff factor:


<b>A.</b>
Is always greater than 1

<b>B.</b>
Has negative value

<b>C.</b>
Has zero value

, <b>D.</b>
Is always less than 1


Q5. van’t Hoff factor for Na■SO■·10H■O solution, assuming complete ionization, is:


<b>A.</b>
1

<b>B.</b>
3

<b>C.</b>
13

<b>D.</b>
2


Q6. We have three aqueous solutions of NaCl labeled as A, B, and C with concentrations 0.1
M, 0.01 M, and 0.001 M respectively. The value of van’t Hoff factors for these solutions will be
in the order:


<b>A.</b>
iA < iB < iC

<b>B.</b>
iA > iB > iC

<b>C.</b>
iA = iB = iC

<b>D.</b>
iA < iB > iC


Q7. The relative lowering of vapor pressure of an aqueous solution containing a non-volatile
solute is 0.0225. The mole fraction of the non-volatile solute is:


<b>A.</b>
0.8

<b>B.</b>
0.725

<b>C.</b>
0.15

<b>D.</b>
0.0225


Q8. The mole fraction of glycerine (C■H■(OH)■) in a solution of 36 g of water and 46 g of
glycerine is:


<b>A.</b>
0.46

<b>B.</b>
0.36

<b>C.</b>
0.20