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What is meant by a pure substance?
What type of mixtures are separated by the technique of crystallization?
Define (a) solute (b) solvent.
Why alloy is considered as a mixture?
Define solution.
Give Reasons for the Following:
Why air is considered as a mixture?
Why is it said that solubility of any solute changes with a change in temperature?
Why Tyndall effect is not observed when light passes through a true solution or suspension?
Why cream separates from milk on churning?
Why different colours present in the ink rise to different levels during paper chromatography?
Differentiate between true solution, colloidal solution and suspension.
List the points of differences between homogeneous and heterogeneous mixtures.
Differentiate between saturated and unsaturated solution.
What is the difference between aqueous and non-aqueous solution?
Explain the following giving examples:
(a) Saturated solution
(b) Unsaturated solution
(c) Suspension.
How will you separate a mixture containing benzene and diesel (difference in their boiling points is more than 50°C), which are miscible with each other?
Describe the method of tea making by using the terminology of:
(a) soluble (b) solvent
(c) solute (d) solution
(e) insoluble (f) filtrate
(g) residue (h) dissolve
What is meant by the concentration of a solution? Explain by giving an example.
Give two characteristics each of:
(a) Pure substances.
(b) Mixtures.
Draw a labelled diagram showing fractional distillation.
Show diagrammatically, how will you separate two immiscible liquids?
Draw a labelled diagram to show separation of dyes in black ink using a chromatography method.
Crystallisation method is used to get salt from sea water. Why is it so?
Fractional distillation method is used for the separation of different gases from air. Why is it so?
Separating funnel is used to separate two immiscible liquids and not the miscible liquids. Why is it so?
Which of the following will show “Tyndall effect”?
What happens when a saturated solution is cooled?
Which of the following is a compound?
Which of the following is an element?
Which of the following is a homogeneous mixture?
Which of the following materials fall in the category of a “pure substance”?
Which of the following is an aqueous solution?
The substances that sublime can be made to liquefy by:
The substances that sublime easily are:
Chromatography is the technique which is used for separation of those solutes that:
Which of the following statements are true for pure substances?
(i). Pure substances contain only one kind of particles
(ii). Pure substances may be compounds or mixtures
(iii). Pure substances have the same composition throughout
(iv). Pure substances can be exemplified by all elements other than nickel
Rusting of an article made-up of iron is called:
A mixture of sulphur and carbon disulphide is:
Tincture of iodine has antiseptic properties. This solution is made by dissolving:
Which of the following are homogeneous in nature?
(i) Ice (ii) Wood
(iii) Soil (iv) Air
Write true or false for the following statements:
The properties that can be observed and specified are called physical properties.
During burning of a candle only chemical change takes place.
Non-metals are lustrous and good conductors of heat and electricity.
Metals are malleable, ductile, sonorous and lustrous.
A compound is a substance composed of two or more elements, chemically combined with one another in a fixed proportion.
