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    Which process is used in large scale desalination of sea water?

    Answer:
    In the large scale desalination of sea water 
    Reverse Osmosis process is used.
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    What type of deviation (+ ve or – ve) is expected of a solution obtained by adding conc. H2SO4 to water?
    Answer:
    Adding conc. H2SO4 to water  Heat is liberated in the process of dissolution, ΔH < 0. The solution formed will show negative deviation from Raoult’s law, A-B attractions > A-A and B-B attractions.
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    Why is the freezing point depressed when a non-volatile solute is dissolved in a liquid solvent?
    Answer:
    When a non- volatile solute is dissolved in a liquid solvent freezing point depressed Because of decrease in vapour pressure. 
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    A person suffering from high blood pressure should take less common salt in the food. Why?
    Answer:

    Common salt (contains Na    + and CI–) dissociates into ions in the blood and increases the osmotic pressure of blood. Therefore, it increases the blood pressure which is harmful.
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    Which of the following has higher vapour pressure at same temperature: CH3OH (b. p. 640.50C) and C2H5OH (b.p. 78.30C)?
    Answer:

    Vapour pressure is related with the molecular weight, lower the molecular weight higher the vapour pressure. since CH3OH has less molecular weight as compare to C2H5OH thus CH    3OH has higher vapour pressure than C2H5OH at the same temperature.
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