One mark and two marks questions for practice.

1. TEST PAPER
solution
One mark questions :
1. Calculate the normality of 1.5 M H2SO4.
2. When is the value of Vant Hoff’s factor is more than one ?
3. How does ∆Tf and ∆Tb related to molecular mass of a solute?
4. The number of moles of NaCl in 3.0 L of 3.0 M solution is :
(a) 1 (b) 3 (c) 9 (d) 27
5. For solutes which do not undergo any association or dissociationin a solute, van’t Hoff’s factor (i) will be :
(a) 1 > (b) >1 (c) 1 (d) 0
Two marks Questions :
6. Calculate the freezing point of an aqueous solution of a non electrolyte having an osmotic pressure of 2 atm at 300K.
(Kf = 1.86 K m–1
, R = 0.082 L atm K–1
mol–1
)
7 100 gm of 5 m urea solution are cooled to –6o
C. What amount of urea will separate out?
8. Calculate molar mass of a substance 1.3 gm of which when dissolved in 169 gm of water gave the solution which will
boil at 100.025oC at 1 atm. (Kb = 0.52 K m–1
)
9. Calculate the boiling point of 1.0 M aqueous solution (density = 1.03 g ml–1
) of NaCl. (Kb = 0.52 K m–1
)
10. Calculate the molarity and molality of 15% solution ( by weight) of H2SO4 of density 1.020 g.cm–3
.