Which of the following will show “Tyndall effect”? (a)Salt solution (b)Milk (c) Copper sulphate solution (d)Starch solution.

Answer: We have 1 mole of CuSO4 contains 1 mole of copper. Molar mass of CuSO4 = Atomic mass of [Cu × 1 + S × 1 + O × 4 ] =(63.5) + (32.00)...

Iron nails become reddish brown in colour and solution becomes green in colour.

(d) homogeneous and does not show Tyndall effect

Hint—Tyndall effect can be seen when light passes through a heterogeneous mixture. Example, when sunlight passes through the canopy of a dense forest.

(a) When dilute sulphuric acid is poured on a copper plate, there will be evolution of hydrogen gas along with the formation of blue color crystals of copper sulphate.  CuSO4 +...

[Hint : (a) The size of dispersed phase particles is not much smaller the wavelength of light used. (b) The refractive indices of the dispersed phase and the dispersion medium differ...

(i) Electrophoresis: The movement of colloidal particles under the influence of an applied electric field is known as electrophoresis. Positively charged particles move to the cathode, while negatively charged particles move...

Soluble in water – Sugar, Salt, Honey, Copper sulphate crystals, Glucose Insoluble in water – Mustard oil, Sand, Sawdust, Chalk powder, Soil, Petals of flower, Wheat flour

Aluminium sulphate is colourless and it does not undergo any change as iron does not react with it. Copper sulphate solution is blue which changes into green due to the...

(i) Hydrated copper sulphate – CuSO4.5H2O Anhydrous copper sulphate – CuSO4  Solutions  Activity : (a) Heat a few crystals of copper sulphate in a dry boiling tube. (b) Add 2 – 3 drops of water...