Different Methods for Expressing the Concentration of Solution (Molality, Molarity, Mole Fraction,..) NEET Questions

Physical Chemistry - Solutions

Different Methods for Expressing the Concentration of Solution (Molality, Molarity, Mole Fraction,..) MCQ Questions


7.
Concentrated nitric acid is 68% HNO₃ by mass with density 1.504 g/mL. What is its molarity? (Molar mass HNO₃ = 63)
A.
23.87 M
B.
10.79 M
C.
16.23 M
D.
6.80 M
😑 View Answer Rough Work Error
ANSWER :
C. 16.23 M
8.
30 g of Co(NO₃)₂·6H₂O (molar mass = 291 g/mol) is dissolved in 4.3 L of solution. The molarity is:
A.
0.024 M
B.
0.072 M
C.
0.103 M
D.
0.012 M
😑 View Answer Rough Work Error
ANSWER :
A. 0.024 M
9.
Molality of a solution is defined as:
A.
Moles of solute per litre of solution
B.
Moles of solute per kg of solvent
C.
Moles of solute per kg of solution
D.
Mass of solute per kg of solvent
😑 View Answer Rough Work Error
ANSWER :
B. Moles of solute per kg of solvent
10.
Which of the following concentration terms is independent of temperature?
A.
Formality
B.
Normality
C.
Molarity
D.
Molality
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ANSWER :
D. Molality
11.
Calculate the molality of 2.5 g of ethanoic acid (CH₃COOH) in 75 g of benzene.
A.
1.667 mol/kg
B.
0.225 mol/kg
C.
0.556 mol/kg
D.
0.0417 mol/kg
😑 View Answer Rough Work Error
ANSWER :
C. 0.556 mol/kg
12.
What mass of urea (NH₂CONH₂, molar mass 60) is required to make 2.5 kg of 0.25 molal aqueous solution?
A.
150.0 g
B.
15.0 g
C.
75.0 g
D.
37.5 g
😑 View Answer Rough Work Error
ANSWER :
D. 37.5 g