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See all →- Which of the following aqueous solution will exhibit highest boiling point? Answer: 3. 0.01M Na₂SO₄ Key idea: elevation of boiling point depends on i× c . Urea: 1×0.01=0.01 . KNO₃ : 2×0.01=0.02 . Na₂SO₄ : 3×0.01=0.03... 1
- Match List - I with List - IIList-I (Example): A. Humidity B. Alloys C. Amalgams D. SmokeList-II (Type of Solution): I. Solid in solid II. Liquid in gas III. Solid in gas IV. Liquid in solidChoose the correct answer from the options given below : Answer: 2. A-II, B-I, C-IV, D-III Key idea: name the dispersed substance and the medium for each example. Humidity: water droplets/vapour in... 1
- 5 moles of liquid X and 10 moles of liquid Y make a solution having a vapour pressure of 70 torr. The vapour pressures of pure X and Y are 63 torr and 78 torr respectively. Which of the following is true regarding the described solution? Answer: 2. The solution shows negative deviation. Key idea: compare the observed vapour pressure with the Raoult's law value. x_X=5/15=1/3 ,... 1
- The plot of osmotic pressure () vs concentration (mol L^-1) for a solution gives a straight line with slope 25.73 L bar mol^-1. The temperature at which the osmotic pressure measurement is done is:(Use R = 0.083 L bar mol^-1 K^-1) Answer: 2. 37 ^° C Key idea: Π=CRT , so the slope of Π vs C is RT . T=25.73/0.083=310\ K=37^°C Option 2. (310 is in kelvin, not ^° C, so opt... 1
- In one molal solution that contains 0.5 mole of a solute, there is Answer: 3. 500 g of solvent Key idea: molality = moles of solute per kg of solvent. 1\ m=0.5/w with w in kg gives w=0.5 kg =500 g of solvent... 1
- The correct option for the value of vapour pressure of a solution at 45^° C with benzene to octane in molar ratio 3 : 2 is :[At 45^° C vapour pressure of benzene is 280 mm Hg and that of octane is 420 mm Hg. Assume Ideal gas] Answer: 3. 336 mm of Hg Key idea: Raoult's law for an ideal solution: P=x₁P₁^°+x₂P₂^° . x_benzene=3/5=0.6 , x_octane=2/5=0.4 . P=0.6(280)+0.... 1