Give reasons for the following :Measurement of osmotic pressure m

Subject

Chemistry

Class

CBSE Class 12

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Sample Papers

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 Multiple Choice QuestionsShort Answer Type

1.

CO(g) and H2 (g) react to give different products in the presence of different catalysts. Which ability of the catalyst is shown by these reactions?


2.

Write the coordination number and oxidation state of Platinum in the complex [Pt(en)2Cl2].


3.

Analysis shows that FeO has a non-stoichiometric composition with formula Fe0.95O. Give reason.


4.

Complete and balance the following chemical equations :

Fe2+ + MnO4- + H+   


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5.

Complete and balance the following chemical equation:

MnO4- + H2O + I-   


6.

For the reaction,2N2O5 (g)   4 NO2 (g)  + O2 (g) the rate of formation of NO2 (g)  is 2.8 x 10-3 Ms-1. Calculate the rate of disappearance of N2O5 (g).


7.

Among the hydrides of Group-15 elements, which have the

  1. Lowest boiling point?
  2. Maximum basic character?
  3. Highest bond angle?
  4. Maximum reducing character?


8.

Calculate the freezing point of a solution containing 60 g of glucose (Molar mass = 180 g mol–1) in 250 g of water.
(Kf of water = 1.86 K kg mol–1)


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9.

An element ‘X’ (At. mass = 40 g mol–1) having f.c.c. the structure has a unit cell edge length of 400 pm. Calculate the density of ‘X’ and the number of unit cells in 4 g of ‘X’. (NA = 6.022 × 1023 mol–1 )


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10.

Give reasons for the following :

Measurement of osmotic pressure method is preferred for the determination of molar masses of macromolecules such as proteins and polymers.


Protein is the high molecular mass material the magnitude of colligative property depends inversely on the molecular mass and osmotic pressure.

Osmotic pressure is fine at room temp, no special arrangements are required and it depends on molarity whereas all other colligative properties depend on molality.


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