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Q. No.The solubility of H2S in water at STP is 0.195 m, The value of Henry’s law constant will be:
1.
274 atm
2.
285 atm
3.
295 atm
4.
278 atm
Subtopic: Concentration Terms & Henry's Law |
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Henry’s law constant for CO2 in water is 1.67 × 108 Pa at 298 K. The quantity of CO2 in 500 mL of soda water when packed under 2.5 atm CO2 pressure at 298 K is:
| 1. | 1.24 g | 2. | 1.45 g |
| 3. | 1.65 g | 4. | 1.85 g |
Subtopic: Concentration Terms & Henry's Law |
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The vapour pressure of pure liquids A and B are 450 and 700 mm Hg respectively, at 350 K. If the total vapour pressure is 600 mm Hg then the composition of the vapour phase are:
1. XA=0.30; XB=0.70
2. XA=0.40; XB=0.60
3. XA=0.20; XB=0.90
4. XA=0.50; XB=0.50
Subtopic: Raoult's Law |
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Vapour pressure of pure water at 298 K is 23.8 mm Hg. 50 g of urea (NH2CONH2) is dissolved in 850 g of water.
The vapour pressure of water (in mm Hg) for this solution is :
The vapour pressure of water (in mm Hg) for this solution is :
| 1. | 23.40 | 2. | 0.23 |
| 3. | 12.87 | 4. | 40.14 |
Subtopic: Raoult's Law |
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If the boiling point of water at 750 mm Hg is 99.63°C, what quantity of sucrose is needed to be dissolved in 500 g of water to achieve a boiling point of 100°C?
(Molal elevation constant for water is 0.52 K kg mol−1 )
1. 128.17 g
2. 121.67 g
3. 125.57 g
4. 116.27 g
(Molal elevation constant for water is 0.52 K kg mol−1 )
1. 128.17 g
2. 121.67 g
3. 125.57 g
4. 116.27 g
Subtopic: Elevation of Boiling Point |
63%
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The mass of ascorbic acid (Vitamin C, C6H8O6) to be dissolved in 75 g of acetic acid
to lower its melting point by 1.5°C, is:
(Kf = 3.9 K kg mol−1)
1. 5.19 g
2. 5.08 g
3. 5.65 g
4. 5.48 g
to lower its melting point by 1.5°C, is:
(Kf = 3.9 K kg mol−1)
1. 5.19 g
2. 5.08 g
3. 5.65 g
4. 5.48 g
Subtopic: Depression of Freezing Point |
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The osmotic pressure in pascals exerted by a solution prepared by dissolving 1.0 g of polymer of molar mass 185,000 in 450 mL of water at 37°C is:
1. 37 Pa
2. 35 Pa
3. 31 pa
4. 41 Pa
1. 37 Pa
2. 35 Pa
3. 31 pa
4. 41 Pa
Subtopic: Osmosis & Osmotic Pressure |
61%
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The molarity of solution obtained when 30 mL of 0.5 M H2SO4 solution diluted to 500 mL is:
| 1. | 0.03 M | 2. | 0.0003 M |
| 3. | 3.0 M | 4. | 30 M |
Subtopic: Concentration Terms & Henry's Law |
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The density of 20% (mass/mass) aqueous KI is 1.202 g mL–1. The molality of KI solution is:
| 1. | 1.21 m | 2. | 1.91 m |
| 3. | 1.71 m | 4. | 1.51 m |
Subtopic: Concentration Terms & Henry's Law |
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The density of 20% (mass/mass) aqueous KI is 1.202 g mL–1. The mole fraction of KI in the solution is:
1. 0.0223
2. 0.0343
3. 0.0163
4. 0.0263
1. 0.0223
2. 0.0343
3. 0.0163
4. 0.0263
Subtopic: Concentration Terms & Henry's Law |
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