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NEW CRISTAL ACADEMY, PALAKKAD
Date: 11-August-2013
Second Year Theory-CBSE
Model Test No.005 - Chemistry
Time: 1½ hours
Max. Marks: 35
Topics
Solutions
Electrochemistry
Alcohols, Phenols & Ethers
Section A
1. What is the van’t Hoff factor for a compound which undergoes tetramerization in an organic solvent?
2. Among 0.1 molal solutions of glucose and sodium chloride respectively, which one will have a higher
boiling point?
3. Write Nernst equation for Daniel cell.
4. The boiling points of ethers are lower than isomeric alcohols.
5. O and P – nitrophenols are more acidic than phenol. Why?
(1×5=5 marks)
Section B
6. Name the reagents which are used in the following conversions
1. A primary alcohol to an aldehyde
2. Butan – 2 – one to butan – 2 – ol
7. Describe a chemical test each to distinguish between the following pairs
1. Ethanol and phenol
2. 1 – propanol and 2 – propanol
8. A solution prepared by dissolving 1.25 g of oil of winter green (methyl salicylate) in 99 g of benzene has a
boiling point of 80.31℃. Determine the molar mass of this compound (B.P of purebenzene = 80.10℃ and
Kb for benzene = 2.53℃ Kg/mol)
9. Define the terms Osmosis and Osmotic pressure what is the advantage of using osmotic pressure as
compared to other colligative properties for the determination of molar masses of solutes in solutions?
10. Calculate the emf of the cell in which the foil : reaction takes place
Ni(S) + 2 Ag+(0.002 M)→Ni2+ (0.160M) + 2 Ag(S)
Given (E°cell = 1.05V)
(2×5 = 10marks)
Section C
11. Account for the following
a. The boiling points of alcohols decrease with increase in branching of the alkyl chain
b. Phenol does not give protonation reaction readily
c. Phenyl methyl ether reacts with HI to give phenol and methyl iodide and not iodobenzene and methyl
alcohol
12. a. Describe the mechanism of hydration of ethene to yield ethanol
b. Write Kolbe’s reaction with an example?
13. a. State the law which helps to determine the limiting molar conductivity of weak electrolyte?
b. Calculate limiting molar conductivity of CaSO4 (λ°m of Calcium and sulpahte ions are 119.0 &
160.Scm2mol-1)
14. State Henry’s law and mention its two important application
15. 100 mg of a protein is dissolved in just enough to make 10ml of solution if this solution has an osmotic
pressure of 13.3 mm Hg at 25℃ what is the molar mass of protein?
(3×5=15 marks)
Section D
16. How are the following conversions be carried out
1. Propene to propan – 2 – ol
2. Anisole to phenol
3. Benzyl chloride to benzyl alcohol
4. Ethyl magnesium bromide to propan – 1- ol
5. 2 methyl propanol to 2 methyl propene
(1×5 = 5 marks)