TEST PAPER CHEMISTRY CLASS 12TH

TEST PAPER – SOLUTION-

SOLUTIONS-XII TOTAL MARKS   56

Q1. A sample of water is distilled at 2 atm pressure. Its b.p.

a)      100⁰C

b)      200⁰C

c)       273⁰C

d)      100 K

Q2. Equimolecular mixture will have same B.P. provided that they do not undergo

a)      Dimerisation

b)      Association

c)        Dissociation

d)      All of above

Q3. The value of van’t Hoff factor for K₄[Fe(CN)₆] is

a)      3

b)      2

c)       4

d)      5

Q4. The freezing point of 0.05 m solution of non-electrolyte in water is

a)      – 1.86⁰C

b)      – 0.93⁰C

c)       – 0.093⁰C

d)       0.93⁰C

Q5. The weight of urea dissolved in 100 mL of solution which produces an osmotic pressure of 20.4 atm at 25⁰C will be

a)      3 g

b)      4 g

c)       5 g

d)      6 g

Q6. The aqueous solution having osmotic pressure nearest to that of equimolecular solution of K₄[Fe(CN)₆] is

a)      BaCI₂

b)      Na₂S0₄

c)       AI₂(S0₄)₃

d)      C₁₂H₂₂0₁₁

Q7. A mixture of ethanol and propanol has a vapour pressure of 290 mm at 27⁰C. if mole fraction of ethanol is 0.65. Then what will be the vapour pressure if vapour pressure of pure ethanol is 210 mm?

a)      333.1 mm

b)      441.5 mm

c)       890.2 mm

d)      None

Q8. For an aqueous solution of K₄[Fe(CN)₆] the observed molecular weight of K₄[Fe(CN)₆] is

a)      73.6

b)      368

c)       76.3

d)      36.8

Q9. The ratio of the value of any colligative property for K₄[Fe (CN)₆] solution to that of K₄[Fe(CN)₆]₃ is

a)      1.0

b)      0.71

c)       1.4

d)      1.5

Q10. Azeotropic mixtures are

a)      Mixture of two solids

b)      Those which boil at different temperature

c)       Constant  boiling mixtures

d)      Immiscible liquids

Q11. Azeotropic mixtures of H₂0 and HCI boils at 108.5⁰C. By distilling the Azeotropic mixtures, it is possible to get

a)      Pure water

b)      Pure HCI

c)       Pure water and HCI

d)      Neither water nor HCI in their pure state.

Q12. The value observed and calculated molecular weight of Ca(N0₃)₂ are 65.4 and 164 respectively. The degree of dissociation of Ca(N0₃)₂ is

a)      80%

b)      67.5%

c)       50%

d)      25%

Q13. At the same temperature, which of the following pairs of the solutions would be isotonic?

a)      0.1M  NaCI and  0.1M  Na₂S0₄

b)      0.1M  Na₂S0₄ and  0.1M  Ca(N0₃)₂

c)       0.1M  NaCI  and  0.1M  urea

d)      0.1M  urea and  0.2M  MgCI₂

Q14. Which of the following statement are correct?

a)      For ideal solution and non-electrolytes,  i = 1

b)      For electrolytes undergoing association , i < 1

c)       For electrolytes undergoing dissociation , i > 1

d)      All are correct

                        All questions are compulsory

                          Negative marks applicable

                          Each question carries 4 Marks