Solutions  MCQs

MCQs of Solutions

Showing 121 to 130 out of 157 Questions
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121.
Which of the following pairs of solutions contain isotonic solutions at normal temperature ?
(a) 0.1 m urea and 0.1 M NaCl
(b) 0.2 M BaCl2 and 0.2 M urea
(c) 0.1 M NaCl and 0.1 M K2SO4
(d) 0.1 M Ba(NO3)2 and 0.1 M Na2SO4
Answer:

Option (d)

122.
Which of the following relations is correct regarding osmotic pressure and Van't Hoff factor ?
(a) i = πobserved · πcalculated
(b) i = πobserved - πcalculated
(c) i = πobserved ÷ πcalculated
(d) i =  πcalculated ÷ πobserved
Answer:

Option (c)

123.
Which of the following is a formula to calculate degree if dissociation ?
(a) αn - α = i
(b) αn - α + 1 = i
(c) αi - α + 1 = n
(d) α - αn - 1 = i
Answer:

Option (b)

124.
Liquid-A and liquid-B form an ideal solution at 20°C. At this temperature, vapour pressures of pure A and pure B are respectively 44.5 and 17.5 mm. If mole fraction of A is 0.2, calculate the (total) vapour pressure of this solution and vapour pressures of components.
(a) P = 22.9 mm, PA = 8.9 mm, PB = 14 mm
(b) P = 22.9 mm, PA = 14 mm, PB = 8.9 mm
(c) P = 62 mm, PA = 44.5 mm, PB = 17.5 mm
(d) P = 27 mm, PA = 17.5 mm, PB = 44.5 mm
Answer:

Option (a)

125.
35 ml 0.1 M HCl solution is required to neutralize 25 ml x M Ba(OH)2M solution. What is the molarity of Ba(OH)2 solution ?
(a) 0.14
(b) 0.28
(c) 0.35
(d) 0.07
Answer:

Option (d)

126.
At a given temperature 5.25% solution of an unknown substance is isotonic with 1.5% urea (molar mass 60 g/mole) solution. If both the solutions have the same solvent and both of them have density equal to 1 g/mole, find the molar mass of the unknown substance.
(a) 90 g/mole
(b) 115 g/mole
(c) 105 g/mole
(d) 210 g/mole
Answer:

Option (d)

127.
Vapour pressure of water at 20°C is 17.5 mm. If 18 g glucose (Molar mass 180 g/mole) is dissolved in 178.2 g water, what will be the vapour pressure of the solution at 20°C ?
(a) 17.675 mm
(b) 15.750 mm
(c) 16.500 mm
(d) 17.325 mm
Answer:

Option (d)

128.
0.5 m HX (weak acid) ionizes to 20% in its aqueous solution. If Kf for water is 1.86 K kg mol-1, what will be the depression (decrease) in the freezing point of the solution ?
(a) 1.12 K
(b) -0.56 K
(c) -1.12 K
(d) 0.56 K
Answer:

Option (c)

129.
0.1 m weak acid ionizes to 30% in aqueous solution. If Kf for water is 1.86, what will be freezing point of the solution ?
(a) -0.18°C
(b) -0.54°C
(c) -0.36°C
(d) -0.24°C
Answer:

Option (d)

130.
Freezing point of 5% (by weight) cane sugar (sucrose) is 271 K. If freezing point of pure water is 273.15 K, what is freezing point of 5% (by weight) glucose aqueous solution ?
(a) 271 K
(b) 273.15 K
(c) 269.07 K
(d) 277.23 K
Answer:

Option (c)

Showing 121 to 130 out of 157 Questions
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