JEE Main & Advanced Chemistry Solutions / विलयन Question Bank

done Critical Thinking Solutions Total Questions - 17

• 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]
  A)
                  0.25        done clear
  B)
                  0.75 done clear
  C)
                  0.50        done clear
  D)
                  0.33 done clear
  View Solution play_arrow

• 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]
  A)
                  74.2        done clear
  B)
                  75.6 done clear
  C)
              67.83      done clear
  D)
                  78.7 done clear
  View Solution play_arrow

• 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]
  A)
                  60           done clear
  B)
                  120 done clear
  C)
                  180         done clear
  D)
                  380 done clear
  View Solution play_arrow

• question_answer4)
  Azeotropic mixture of HCl and water has [AFMC 1997; JIPMER 2002]
  A)
                  84% HCl                done clear
  B)
                  22.2% HCl done clear
  C)
                  63% HCl                done clear
  D)
                  20.2% HCl done clear
  View Solution play_arrow

• 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]
  A)
                  0.8 atm   done clear
  B)
                  0.08 atm done clear
  C)
                  8.1 atm   done clear
  D)
                  9.1 atm done clear
  View Solution play_arrow

• 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]
  A)
                  2.36        done clear
  B)
                  1.50 done clear
  C)
              1.95        done clear
  D)
                  1.00 done clear
  View Solution play_arrow

• 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]
  A)
                  \[149.5\,g\,mol{{e}^{-1}}\]               done clear
  B)
                  \[120\,g\,mol{{e}^{-1}}\] done clear
  C)
                  \[430\,g\,mol{{e}^{-1}}\] done clear
  D)
                  None of these done clear
  View Solution play_arrow

• 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]
  A)
                  144.50   done clear
  B)
                  143.18 done clear
  C)
                  140.28   done clear
  D)
                  146.66 done clear
  View Solution play_arrow

• 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]
  A)
                  79.42 g/mol           done clear
  B)
                  132.32 g/mol done clear
  C)
                  177.42 g/mol         done clear
  D)
                  242.32 g/mol done clear
  View Solution play_arrow

• 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]
  A)
                  \[12.2\,g\,mo{{l}^{-1}}\]   done clear
  B)
                  \[15.4\,g\,mol\] done clear
  C)
                  \[17.3\,g\,mo{{l}^{-1}}\]   done clear
  D)
                  \[20.4\,g\,mol\] done clear
  View Solution play_arrow

• 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]
  A)
                  250 K     done clear
  B)
                  294 K done clear
  C)
                  51.6 K    done clear
  D)
                  12.5 K done clear
  View Solution play_arrow

• 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]
  A)
                  \[-{{0.31}^{o}}C\]             done clear
  B)
              \[-{{0.45}^{o}}C\] done clear
  C)
                  \[-{{0.53}^{o}}C\]             done clear
  D)
                  \[-{{0.90}^{o}}C\] done clear
  View Solution play_arrow

• 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]
  A)
                  \[[Pt{{(N{{H}_{3}})}_{4}}C{{l}_{3}}]\,Cl\]  done clear
  B)
              \[[Pt{{(N{{H}_{3}})}_{4}}Cl]\,C{{l}_{2}}\] done clear
  C)
                  \[[Pt{{(N{{H}_{3}})}_{4}}C{{l}_{2}}]\,C{{l}_{3}}\]  done clear
  D)
                  \[[Pt{{(N{{H}_{3}})}_{4}}C{{l}_{4}}]\] done clear
  View Solution play_arrow

• 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]
  A)
                  50 g/mole               done clear
  B)
                  46 g/mole done clear
  C)
                  55 g/mole               done clear
  D)
                  60 g/mole done clear
  View Solution play_arrow

• 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]
  A)
                  0.0049   done clear
  B)
                  4.9 + 0.001 done clear
  C)
                  4.9          done clear
  D)
                  0.49 done clear
  View Solution play_arrow

• 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]
  A)
                  22.4        done clear
  B)
                  2.24 done clear
  C)
                  0.224      done clear
  D)
                  5.6 done clear
  View Solution play_arrow

• 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]
  A)
                  Same as that of 2nd solution done clear
  B)
                  Nearly one-fifth of the 2nd solution done clear
  C)
                  Double that of 2nd solution done clear
  D)
                  Nearly five times that of 2nd solution done clear
  View Solution play_arrow