1. A
   Milk in water
2. B
   Common salt in water
3. C
   Egg albumin in water
4. D
   Sugar in water.

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1. A
   iodine in water
2. B
   iodine in potassium iodide
3. C
   iodine in water
4. D
   iodine in alcohol.

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1. A
   a dye
2. B
   an acid
3. C
   a detergent
4. D
   a base.

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1. A
   add the thin paste of starch to hot water with stirring
2. B
   add starch powder to cold water and boil
3. C
   add the starch powder to boiling water and cool
4. D
   heat starch, add it to cold water and then bring it to boil.

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1. A
   Z, X, Y, W
2. B
   X, Y, Z, W
3. C
   W, X, Y, Z
4. D
   Y, X, Z, W.

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1. A
   In China dish II, a new compound is formed, which is different from iron filings and dilute hydrochloric acid.
2. B
   In China dish I, a mixture is formed, where iron filings and sulphur powder can be seen separately.
3. C
   A colourless and odourless gas comes out from China dish II.
4. D
   All of these.

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1. A
   Soil
2. B
   Sand
3. C
   Starch
4. D
   Sugar.

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1. A
   (i) and (iv)
2. B
   (iii) and (iv)
3. C
   (i), (ii) and (iv)
4. D
   (i) and (ii).

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1. A
   (a), (b) and (c) are correct
2. B
   (b) and (c) are correct
3. C
   All of these
4. D
   (a) and (d) are correct.

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1. A
   starch
2. B
   fat
3. C
   protein
4. D
   glucose.

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1. A
   True solution
2. B
   Starch + Water
3. C
   Alum + Water
4. D
   NaCl + Water.

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1. A
   visible with a powerful microscope
2. B
   not visible with a powerful microscope
3. C
   visible with the naked eye
4. D
   visible with a simple microscope.

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1. A
   Redox reaction
2. B
   Reversible change
3. C
   Chemical change
4. D
   Physical change.

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1. A
   Solid particles settle at the bottom after sometimes
2. B
   Its particles are seen by naked eyes
3. C
   It is transparent
4. D
   Its components can be separated by filtration.

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1. A
   True solution
2. B
   Mixture
3. C
   Colloidal
4. D
   Suspension.

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1. A
   no change of colour in any test tube
2. B
   a change of colour to blue-black in both tubes 'A' and 'B'
3. C
   a change of colour to blue-black in test tube 'B' but not in test tube 'A'
4. D
   a change of colour to blue-black in test tube 'A' but not in test tube 'B'.

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1. A
   No energy change occurs
2. B
   All statements are correct
3. C
   The change can be easily reversed
4. D
   No new substances are formed.

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1. A
   I, II, III and IV
2. B
   I and II only
3. C
   III and IV only
4. D
   I, III and IV only.

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1. A
   colloid
2. B
   mixture
3. C
   suspension
4. D
   true solution.

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1. A
   (i), (ii) and (iii)
2. B
   (ii), (iii) and (iv)
3. C
   (i), (ii) and (iv)
4. D
   (i), (iii) and (iv).

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1. A
   (iii) and (iv)
2. B
   (i) and (iii)
3. C
   (i) and (iv)
4. D
   (ii), (iii) and (iv).

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1. A
   heterogeneous and shows Tyndall effect
2. B
   heterogeneous and does not show Tyndall effect
3. C
   homogeneous and shows Tyndall effect
4. D
   homogeneous and does not show Tyndall effect.

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1. A
   Mixing $\text{BaSO}_4$ + NaCl
2. B
   Mixing $\text{NH}_3$ and HCl
3. C
   Burning magnesium in air
4. D
   Adding NaCl to water.

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1. A
   alum
2. B
   egg albumin
3. C
   common salt
4. D
   sugar.

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1. A
   safranin
2. B
   iodine
3. C
   eosin
4. D
   methylene blue.

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