Question Pool Solutions

Solutions - SAMAGRA Question Pool & Answers | Class 12

Kerala Syllabus SAMAGRA SCERT SAMAGRA Question Pool for Class 12 Chemistry Solutions

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Qn 1.

The principle behind the desalination of sea water using a semi-permeable membrane is:

  1. Diffusion b) reverse osmosis   c) elevation of boiling point d) depression of freezing point


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Qn 2.

The most suitable concentration term used when the solute is present in trace amount is:

  1. Molality b) Molarity c) Parts per million d) mass percent


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Qn 3.

Acetic acid undergoes dimerisation in benzene. If there is 100% association, the value of van’t Hoff factor (i) becomes:



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Qn 4.

 Our blood cells are isotonic with 0.9% (mass/volume) NaCl solution.

  1. What are isotonic solutions?

   b.What happens when the blood cells are placed in a solution containing more than 0.9% (mass/volume) NaCl solution?



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Qn 5.

 Solubility of a gas in a liquid is affected by many factors like temperature, pressure, nature of the gas etc.

  1. ‘Aquatic species are more comfortable in cold waters rather than in warm waters.’ Account for this statement.
  2. What is the effect of pressure in the solubility of a gas in a liquid?
  3. Name the law which relates solubility of a gas in a liquid and its partial pressure and state it?


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Qn 6.

 The components of a mixture of 68% by mass of Nitric acid in water cannot be separated by fractional distillation.

a) Give reason for the above observation.

b) Which type of deviation from Raoult's law is shown by the above mixture?



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Qn 7.

The principle behind the desalination of sea water using a semi-permeable membrane is:

  1. Diffusion b) reverse osmosis   c) elevation of boiling point d) depression of freezing point

 



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Qn 8.

a) Mention the conditions to be satisfied for an ideal solution.

b) Heptane and octane form an ideal solution. At 373K, the vapour pressures of the pure liquids are 105.2 kPa and 46.8 kPa respectively. What will be the vapour pressure of a mixture of 26g of heptanes and 35g of octane?



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Qn 9.

In which of the following solvent NaCl dissolves – water or kerosene? Why?



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Qn 10.

A mixture of ethanol and acetone form non-ideal solution with positive deviation from Raoult's law. Give reason and represent the deviation graphically.



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Qn 11.

1. Define molarity and molality.

2. Among molarity and molality which depends on temperature ? Explain.



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Qn 12.

Molarity (M), Molality (m) and mole fraction (x) are some methods for expressing concentration of solutions.
a) Which of these are temperature independence
b) define molarity
c) A mixture containing 3.2 gram methanol ( molecular mass = 32u) and 4.6 gram ethanol

(molecular mass = 46u). Find the mole fraction of each component



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Qn 13.

In a solution of two liquid components A & B ,at molecular level, A-B atractions are weaker than those between A-A  and  B-B.Then the type of deviation shown by this solution is ...



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Qn 14.

What are Ideal Solutions? Give the condition for their formatrion.



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Qn 15.

What are colligative properties?



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Qn 16.

Write one application of reverse osmosis



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Qn 17.

Derive an expression to find molar mass of an unknown solute by elevation of boiling point method.



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Qn 18.

Which of the following concentration terms depends on temperature?

  1. Mole fraction
  2. Molarity
  3. Molality
  4. Mass percent


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Qn 19.

a. Define colligative properties.

b. Write an expression for the calculation of molar mass of a solute from  its osmotic pressure.

c. At 298K,the osmotic pressure of 100 mLsolution containing 3.002g of an unknown solute is found as 2.55atm. Calculate the molar mass of the solute.



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Qn 20.

Which colligative property is preferred for the molar mass determination of macromolecules and why ?



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Qn 21.

a).What is meant by Non idealsolution?

b)Which type of deviation shown by the mixture of ethanol and water.Explain?



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Qn 22.

Why is ethylene glycol added to the water used in the radiator of a car while driving in a hill station?



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Qn 23.

Explain why sodium chloride or anhydrous calcium chloride is used to clear snow on roads.



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Qn 24.

When two liquids are mixed, the resulting solution is found to be cooler. What do you conclude about deviation from ideal behaviour?



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Qn 25.

Mixing of acetone with chloroform takes place with reduction in volume. What type of deviation from Raoult’s law is shown in this case?



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Qn 26.

Arrange the following in increasing order of their boiling points: 0.001 M NaCl, 0.001 M urea, 0.01 M MgCl2, 0.01 M NaCl.

 



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