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


1.
Molarity of a solution is defined as the number of moles of solute dissolved in:
A.
1 kg of solution
B.
1 kg of solvent
C.
1 litre of solution
D.
1 litre of solvent
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ANSWER :
C. 1 litre of solution
2.
Calculate the molarity of a solution containing 5 g of NaOH in 450 mL of solution.
A.
0.225 M
B.
0.278 M
C.
0.125 M
D.
0.500 M
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ANSWER :
B. 0.278 M
3.
What is the molarity of pure water (density = 1 g/mL)?
A.
100 M
B.
18 M
C.
1 M
D.
55.56 M
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ANSWER :
D. 55.56 M
4.
30 mL of 0.5 M H₂SO₄ is diluted to 500 mL. What is the molarity of the diluted solution?
A.
0.30 M
B.
0.05 M
C.
0.15 M
D.
0.03 M
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ANSWER :
D. 0.03 M
5.
Molarity of a solution changes with temperature because:
A.
Mass of solute changes with temperature
B.
Volume of solution changes with temperature
C.
Mass of solvent changes with temperature
D.
Moles of solute change with temperature
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ANSWER :
B. Volume of solution changes with temperature
6.
What mass of Na₂CO₃ is required to prepare 250 mL of 0.1 M solution? (Molar mass = 106 g/mol)
A.
1.06 g
B.
10.6 g
C.
2.65 g
D.
5.30 g
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ANSWER :
C. 2.65 g