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101.

Effect of adding a non-volatie solute to a solvent is"A. to lower the vapour pressureB. to increase its freezing pointC. to increase its boiling pointD. to decrease its osmotic pressure

Answer» Correct Answer - A::C
Discussion
102.

Which of the following is/are correct for a solution of a particular concentrations ?A. Molarity is always less than molalityB. Formality is equivalent to molarityC. Mole fraction is equivalent to mass fractionD. Normality of `H_(2)SO_(4)` solution is double than its molarity.

Answer» Correct Answer - B::D
Discussion
103.

In the depression of freezing point experiment, it is found that the:A. the vapour pressure of the solution is less than that of pure solventB. the vapour pressure of solution is more than that of pure solventC. only solute molecules solidify at the freezing pointD. only solvent molecules solidify at the freezing point

Answer» Correct Answer - A::D
Discussion
104.

Which of the following concentration terms is/are independent of temperature ?A. MolarityB. Molarity and mole fractionC. Mole fraction and molalityD. Molality and normality

Answer» Correct Answer - C
Discussion
105.

In which mode of expression, the concentration of a solution remains independent of temperature?A. NormalityB. MolalityC. MolarityD. Formality

Answer» Correct Answer - B
Discussion
106.

Mole fraction of `C_(3)H_(5)(OH)_(3)` in a solution of `36g` of water and `46g` of glycerine is:A. 0.46B. 0.36C.D. `0.20`

Answer» Correct Answer - C
Discussion
107.

A certain non-volatile substance (non-electrolyte) contains 40%C, 6.7%H, 53.3 % O. An aqueous solution containing 5% by mass of the solute boils at `100.15^(@)C`. Molecular formula of the compound is :A. `CH_(2)O`B. `C_(2)H_(4)O_(2)`C. `C_(6)H_(12)O_(6)`D. `C_(12)H_(22)O_(11)`

Answer» Correct Answer - C
Discussion
108.

The vapour pressure of pure benzene at a certain temperature is `640 mm` of `Hg`. A non-volatile non-electrolyte solid weighing `2.175 g` added `39.0 g` of benzene. The vapour pressure of the solution is `600 mm` of `Hg`. What is the molecular weight of solid substance?A. `49.50`B. 59.6C. 69.5D. 79.8

Answer» Correct Answer - C
Discussion
109.

A solution containing `10 g per dm^(3)` of urea (mol.wt. `= 60 g mol^(-1)`) is isotonic with a `5%` ( mass//vol.) of a non-volatile solute. The molecular mass of non-volatile solute is:A. `"300 g mol"^(-1)`B. `"350 g mol"^(-1)`C. `"200 g mol"^(-1)`D. `"250 g mol"^(-1)`

Answer» Correct Answer - A
Discussion
110.

A solution of urea contains 8.6 g per litre. It is isotonic with 5% solution of a non-volatile solute. The molecular mass of the solute will be :A. 349B. 34.9C. 3490D. 861

Answer» Correct Answer - A
Discussion
111.

Isotonic solutions have :A. same boiling pointB. same vapour pressureC. same melting pointD. same osmotic pressure

Answer» Correct Answer - D
Discussion
112.

A 0.004 M solution of `Na_(2)SO_(4)` is isotonic with a 0.010 M solution of glucose at same temperature. The apparent degree of dissociation fo `Na_(2)SO_(4)` isA. 0.25B. 0.5C. 0.75D. 0.85

Answer» Correct Answer - C
Discussion
113.

If the observed and normal osmotic pressures of a KCl solution are 5.85 and 3.20 atm, the degree of dissociation of KCl is :A. 1B. 0.082C. 0.82D. 0.28

Answer» Correct Answer - C
Discussion
114.

Which one of the following pairs of solutions will be expected to be isotonic under the same temperature ?A. 0.1 M urea and 0.1 M NaClB. 0.1 M urea and 0.2 M `MgCl_(2)`C. 0.1 M NaCl and M `Na_(2)SO_(4)`D. `0.1 M Ca(NO_(3))_(2) and 0.1 M Na_(2)SO_(4)`

Answer» Correct Answer - D
Discussion
115.

The osmotic pressure of a solution at 273 K is 2.5 atm. Its osmotic pressure at 546 K under similar conditions will be :A. 0.5 atmB. 1.0 atmC. 2.5 atmD. 5.0 atm

Answer» Correct Answer - D
Discussion
116.

Statement - The vapour pressure of `0.1 M` sugar solution is more than that of `0.1 M` potassium chloride solution. Explanation- Lowering of vapour pressure is directly proportional to the number of species present in the solution.A. If both (A) and (R) are correct and (R) is the correct explanation for (A)B. If both (A) and (R) are correct but (R) is not correct explanation for (A)C. If (A) is correct but (R) is incorrectD. If (A) is incorrect but (R) is correct

Answer» Correct Answer - A
Discussion
117.

Equal mass of a soute are dissolved in equal mass of two solvents A and B and formed very dilute solution. The relative lowering of vapour pressure for the solution B has twice the relative lowering of vapour pressure for the solution A. If `m_(A) "and" M_(B)` are the molecules mass of solventds A and B respectively, then :A. `M_(A) = M_(B)`B. `M_(A) = M_(B) //2`C. `M_(A) = 4M_(B)`D. `M_(A) = 2M_(B)`

Answer» Correct Answer - B
Discussion