The most convenient way of expressing solution concentration is in terms of___________________?

Related Mcqs:

1. 80 kg of Na2SO4 (molecular weight = 142) is present in 330 kg of an aqueous solution. The solution is cooled such that. 80 kg of Na2SO4 .10H2O crystals separate out. The weight fraction of Na2SO4 in the remaining solution is_________________?

   A. 0.00
   B. 0.18
   C. 0.24
   D. 1.00

2. Acidity or alkanity of a solution is expressed by its pH value, which is defined as (where, [H+] = hydrogen ion concentration in the solution) ?

   A. log (1/H+)
   B. – log (1/H+)
   C. 1/log H+
   D. None of these

3. The pH value of a solution is 5.9. If the hydrogen ion concentration is decreased hundred times, the solution will be______________?

   A. Basic
   B. More acidic
   C. Neutral
   D. Of the same acidity

4. Na2SO4. 10H2O crystals are formed by cooling 100 Kg of 30% by weight aqueous solution of Na2SO4. The final concentration of the solute in the solution is 10%. The weight of crystals is________________?

   A. 20
   B. 32.2
   C. 45.35
   D. 58.65

5. On addition of 1 c.c. of dilute hydrochloric acid (1% concentration) to 80 c.c. of a buffer solution of pH = 4, the pH of the solution becomes_________________?

   A. 1
   B. 8
   C. 4
   D. 2

6. Concentration of a solution expressed in terms of _______________ is independent of temperature?

   A. Molarity
   B. Normality
   C. Molality
   D. None of these

7. The activity co-efficient of a solution, which accounts for the departure of liquid phase from ideal solution behaviour________________?

   A. Measures the elevation in boiling point
   B. Is not dependent on the temperature
   C. Is a function of the liquid phase composition
   D. Measures the depression in freezing point

8. At room temperature, the product [H+] [OH-] in a solution is 10-14 moles/litre. If, [OH-] = 10-6 moles/litre, then the pH of the solution will be ________________________?

   A. 6
   B. 8
   C. 10
   D. 12

9. If pH value of an acidic solution is decreased from 5 to 2, then the increase in its hydrogen ion concentration is _____________ times?

   A. 10
   B. 100
   C. 1000
   D. 10000

10. pH value of a solution containing equal concentration of hydroxyl and hydrogen ions will be_________________?

    A. 0
    B. 10
    C. 7
    D. 14