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Chemistry - section-15
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Chemistry - section - 2
  1. White phosphorus is always kept under

    2. A.

     Benzene
    B.

     Kerosene
    C.

     Ether
    D.

     Water

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  2. Milk is a colloidal system in which:

    3. A.

     Water is dispersed in fat
    B.

     Fat is dispersed in water
    C.

     Fat and water are dispersed in each other
    D.

     Fat is dissolved

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  3. An emulsion is a colloid of a

    4. A.

     Gas in a liquid
    B.

     Liquid in a liquid
    C.

     Liquid in a gas
    D.

     Gas in a solid

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  4. An emulsion is a colloidal solution of

    5. A.

     Liquid in liquid
    B.

     Solid in liquid
    C.

     Gas in solid
    D.

     Solid in Solid

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  5. Colloids can be purified by

    6. A.

     Condensation
    B.

     Condensation
    C.

     Condensation
    D.

     Dialysis

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  6. A colloidal system in which a liquid is dispersed in a liquid is called

    7. A.

     Gel
    B.

     Emulsion
    C.

     Sol
    D.

     Precipitate

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  7. Which is a natural colloid ?

    8. A.

     Sodium chloride
    B.

     Urea
    C.

     Cane-sugar
    D.

     Blood

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  8. Suspension particles have the size between

    9. A.

     10–2 – 10–4 cm
    B.

     10–5 – 10–7cm
    C.

     10–8 – 10–10cm
    D.

     10–1 – 10–2 cm

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  9. Which of the following acts as best adsorbent?

    10. A.

     Charcoal
    B.

     Activated Charcoal
    C.

     Activated Coconut Charcoal
    D.

     Carbon black

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  10. Gelatin is mostly used in making ice-creams in order to

    11. A.

     Prevent making a colloid
    B.

     Stabilise the colloid and prevent crystallisation
    C.

     Stabilise mixture
    D.

     Enrich the aroma

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