Equal weights of two substances X and Y are dissolved in equal v
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    Subject
    Chemistry

    Class

    ICSE Class 12

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    ISC Class 12 Chemistry Solved Question Paper 2009

    Multiple Choice QuestionsShort Answer Type

    11. Correct the following statements by changing the underlined part of the sentence. (Do not change the whole sentence) : 

    An aqueous solution of sodium sulphate is acidic in nature.

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    12. Correct the following statements by changing the underlined part of the sentence. (Do not change the whole sentence) : 

    The solubility product of silver chloride in water decreases on the addition of potassium chloride to the solution.

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    13. The boiling point of pure water is 373K. Calculate the boiling point of an aqueous solution containing 18 gms of glucose (MW = 180) in 100 gms of water. Molal elevation constant of water is 0.52 K kg mol-1.   
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    14. Equal weights of two substances X and Y are dissolved in equal volumes of water. The osmotic pressure of the solution containing Y is five times the osmotic pressure of the solution containing X. What is the molecular weight of X if that of Y is 60?

    We have given,

    Molecular weight of Y = 60

    Osmotic pressure of solution of Y is 5 times the solution containing X.

    Let molecular weight  x = Mx


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    15.

    Which of the following solutions will have a lower vapour pressure and why ?

    (1) A 5% solution of cane sugar (CI2H22O11)

    (2) A 5% solution of urea (NH2CO NH2)

    (Relative atomic masses: H = 1, C = 12, 0 = 16, N = 14).

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    16. When ammonium chloride and ammonium hydroxide are added to a solution containing both Al+3and Ca+2 ions, which ion is precipitated? Why?
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    17. Explain why a solution of copper chloride is acidic while that of sodium chloride is neutral.
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    18.

    (i) In a body centred and face centred arrangement of atoms of an element, what will be the number of atoms present in respective unit cells?   

    (ii) Explain why graphite is soft and can be used an a lubricant.

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    19. 1.0 gm. of strontium - 90 was reduced to 0.953 gm after two years. Calculate the half- life period of strontium - 90.
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    20. Mention any two factors affecting the electrode potential of a metal.
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