Which one of the following may be termed as pure substance?

A mixture of ammonium chloride and sand can be separated by

The solvent used to prepare colloidal solution shows Tyndall effect ___________

Cream is separated solution of liquid in ...................

What is chemically a pure substance?

Al alloy cannot be separated into its constituents by physical methods but still, it is considered a homogeneous mixture. Explain.

(i) Which of the following will show Tyndall effect? why?
(a) salt solution
(b) Milk
(c) Copper sulphate solution
(d) Starch solution.
(ii) Which of the two will scatter light: soap solution or salt solution?

Define the following terms:
(i) True solution
(ii) Solute
(iii) Solvent      
(iv) Solubility.

What are the advantages and disadvantages of crystallisation over evaporation?

(a) name the separation techniques which you will apply the separation of the following mixtures:
(i) Small piece of metal in the engine oil of a car
(ii) Fine mud particles suspended in water 
(iii) Oil from water.
(iv) Sodium chloride from its solution in water.
(v) Camphor from salt.
(vi) Wheat grains from husk.
(b) Classify the following as a chemical or physical change:
(i) Water boils to form steam.
(ii) Burning of paper.
(iii) An almirah gets rusted.
(iv) Making a fruit salad with raw fruits.

List in tabular from any three differences between true solution, colloidal solution and suspension.

A silver ornament of mass m gram is polished with gold equivalent to 1% of the mass of silver. Compute the ratio of the number of atoms of gold and silver in the ornament.