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1
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The vapour pressure of pure liquid X and pure liquid Y at 25 °C are 120 mm Hg and 160 mm Hg respectively. If equal moles of X and Y are mixed to form an ideal solution, calculate the vapour pressure of the solution.
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140 mm of HG
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2
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An antifreeze solution is prepared by dissolving 31 g of ethylene glycol (Molar mass = 62 g mol-1) in 600 g of water. Calculate the freezing point of the solution. (K, for water = 1.86 K kg mol-1).
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Tf= 27145
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3
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Calculate the mass of ascorbic acid (Molar mass = 176 g mol-1) to be dissolved in 75 g of acetic acid, to lower its freezing point by 1.5°C. (K, = 3.9 K kg mol-1)
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Wb=5.077g
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4
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Calculate the mass of ascorbic acid (Molar mass = 176 g mol -1) to be dissolved in 75 g of acetic acid, to lower its freezing point by 1.5°C. (K, = 3.9 K kg mol -1)
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17.46 mm
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5
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30 g of urea (M = 60 g mol -1) is dissolved in 846 g of water. Calculate the vapour pressure of water for this solution if vapour pressure of pure water at 298 K is 23.8 mm Hg.
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23.5
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6
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Ishan's automobile radiator is filled with 1.0 kg of water. How many grams of ethylene glycol (Molar mass = 62 g mol-1) must Ishan add to get the freezing point of the solution lowered to -2.8 °C. (K, for water is 1.86 K kg mol -1)
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Wb = 93.33 g
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7
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A 0.01 m aqueous solution of AlCla freezes at -0.068 °C. Calculate the percentage of dissociation. (Given : K, for water = 1.86 K kg mol -1]
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88.3%
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8
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Determine the osmotic pressure of a solution prepared by dissolving 25 mg of K,so, in 2 litres of water at 25°C assuming it to be completely dissociated. (Atomic masses: K = 39 u, S = 32 u, 0 = 16 u)
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5.27 x 10-3
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9
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A first order reaction is 40% complete in 80 minutes. Calculate the value of rate constant (k). In what time will the reaction be 90% completed?
(Given : log 2 = 0.3010, log 3 = 0.4771, log 4 = 0.6021, log 5 = 0.6771, log 6 = 0.7782]
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360
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10
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For the reaction : 2N2O5(g) → 4NO2(g) + O2(g) at 318 K Calculate the rate of reaction if rate of disappearance of N2O5(g) is 1.4 × 10-3Ms -1?
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7x10 -4Ms-1
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