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question_answer1) On adding solute to a solvent having vapour pressure 0.80 atm, vapour pressure reduces to 0.60 atm. Mole fraction of solute is [UPSEAT 2003]
question_answer2) A solution containing 30 gms of non-volatile solute in exactly 90 gm water has a vapour pressure of 21.85 mm Hg at \[{{25}^{o}}C\]. Further 18 gms of water is then added to the solution. The resulting solution has a vapour pressure of 22.15 mm Hg at \[{{25}^{o}}C\]. Calculate the molecular weight of the solute [UPSEAT 2001]
question_answer3) Vapour pressure of a solution of \[5g\] of non- electrolyte in \[100g\] of water at a particular temperature is \[2985\,N/{{m}^{2}}\]. The vapour pressure of pure water is \[3000N/{{m}^{2}}\]. The molecular weight of the solute is [IIT Screening 1993]
question_answer4) Azeotropic mixture of HCl and water has [AFMC 1997; JIPMER 2002]
question_answer5) The osmotic pressure at \[{{17}^{o}}C\] of an aqueous solution containing 1.75 g of sucrose per 150 ml solution is [BHU 2001]
question_answer6) A 1.2 of solution of NaCl is isotonic with 7.2 of solution of glucose. Calculate the van?t Hoff?s factor of NaCl solution [UPSEAT 2001]
question_answer7) \[0.6\,g\] of a solute is dissolved in \[0.1\,litre\] of a solvent which develops an osmotic pressure of 1.23 atm at \[{{27}^{o}}C\]. The molecular mass of the substance is [BHU 1990]
question_answer8) The boiling point of a solution of 0.1050 gm of a substance in 15.84 gram of ether was found to be \[{{100}^{o}}C\] higher than that of pure ether. What is the molecular weight of the substance [Molecular elevation constant of ether per 100 g = 21.6] [UPSEAT 2001]
question_answer9) Boiling point of chloroform was raised by 0.323 K, when 0.5143 g of anthracene was dissolved in 35 g of chloroform. Molecular mass of anthracene is (\[{{K}_{b}}\] for \[CHC{{l}_{3}}\]= 3.9 kg mol?1) [Pb PMT 2000]
question_answer10) The boiling point of water (\[{{100}^{o}}C\]) becomes \[{{100.52}^{o}}C\], if 3 grams of a nonvolatile solute is dissolved in \[200ml\] of water. The molecular weight of solute is (\[{{K}_{b}}\] for water is \[0.6\,K-m\]) [AIIMS 1998]
question_answer11) Normal boiling point of water is 373 K (at 760mm). Vapour pressure of water at 298 K is 23 mm. If the enthalpy of evaporation is 40.656 kJ/mole, the boiling point of water at 23 mm pressure will be [CBSE PMT 1995]
question_answer12) A 0.2 molal aqueous solution of a weak acid (HX) is 20% ionised. The freezing point of this solution is (Given \[{{K}_{f}}={{1.86}^{o}}C/m\] for water) [IIT 1995]
question_answer13) A 0.001 molal solution of \[[Pt{{(N{{H}_{3}})}_{4}}C{{l}_{4}}]\] in water had a freezing point depression of \[{{0.0054}^{o}}C\]. If \[{{K}_{f}}\] for water is 1.80, the correct formulation for the above molecule is [Kerala CET (Med.) 2003]
question_answer14) An aqueous solution of a weak monobasic acid containing 0.1 g in 21.7g of water freezes at 272.813 K. If the value of \[{{K}_{f}}\] for water is 1.86 K/m, what is the molecular mass of the monobasic acid [AMU 2002]
question_answer15) \[{{K}_{f}}\] of 1,4-dioxane is 4.9 \[mo{{l}^{-1}}\] for 1000 g. The depression in freezing point for a 0.001 m solution in dioxane is [DPMT 2001]
question_answer16) How many litres of \[C{{O}_{2}}\] at STP will be formed when \[100ml\] of \[0.1\,M\,{{H}_{2}}S{{O}_{4}}\] reacts with excess of \[N{{a}_{2}}S{{O}_{3}}\] [EAMCET 1998]
question_answer17) A solution is obtained by dissolving 12 g of urea (mol.wt.60) in a litre of water. Another solution is obtained by dissolving 68.4 g of cane sugar (mol.wt. 342) in a litre of water at are the same temperature. The lowering of vapour pressure in the first solution is [CPMT 2001]
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