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


13.
The molality of 1 M NaCl solution (density = 1.04 g/mL) is approximately:
A.
0.96 m
B.
1.04 m
C.
1.00 m
D.
0.99 m
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ANSWER :
D. 0.99 m
14.
45 g of ethylene glycol (C₂H₆O₂) is dissolved in 600 g of water. The molality is:
A.
0.73 mol/kg
B.
1.21 mol/kg
C.
2.42 mol/kg
D.
0.605 mol/kg
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ANSWER :
B. 1.21 mol/kg
15.
A 1 molal solution of KCl in water means:
A.
1 mol KCl in 1 L solution
B.
74.5 g KCl in 1 L solution
C.
1 mol KCl in 1 kg water
D.
1 mol KCl in 1 kg solution
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ANSWER :
C. 1 mol KCl in 1 kg water
16.
Sum of mole fractions of all components in a solution is always:
A.
0
B.
Variable
C.
100
D.
1
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ANSWER :
D. 1
17.
Calculate the mole fraction of ethylene glycol (C₂H₆O₂) in a solution containing 20% C₂H₆O₂ by mass.
A.
0.200
B.
0.068
C.
0.322
D.
0.932
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ANSWER :
B. 0.068
18.
Mole fraction of benzene in a solution containing 30% benzene by mass in CCl₄ is:
A.
0.300
B.
0.459
C.
0.700
D.
0.541
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ANSWER :
B. 0.459