Chapter 2 – Is Matter Around Us Pure?

What is the boiling point of acetone?

Who was the first scientist to use the term ‘element’ in 1661?

Boron, silicon, germanium, etc., are:

The major component of a solution is called:

Which of the following will show the “Tyndall effect”?

The size of colloidal particles are:

Which of the following are physical changes?
(i) Melting of iron metal
(ii) Rusting of iron
(iii) Bending of an iron rod
(iv) Drawing a wire of iron metal

Which of the following are chemical changes?
(i) Decaying of wood
(ii) Burning of wood
(iii) Sawing of wood
(iv) Hammering of a nail into a piece of wood

Which of the following are homogeneous in nature?
(i) Ice
(ii) Wood
(iii) Soil
(iv) Air

What is known as ‘tincture iodine’?

Which technique is used to separate two immiscible liquids?

What is a substance composed of two or more elements, chemically combined with one another in a fixed proportion known as?

Name a metallic element found in a liquid state at room temperature.

How would you separate common salt and iodine from their mixture?

What is the name of the metal which exists in liquid state at room temperature?

When the liquid is spun rapidly, the denser particles are forced to the bottom and the lighter particles stay at the top. This principle is used in:

What is the name of the metal which exists in liquid state at room temperature?

Which of the following elements is not a metalloid?

If we put camphor in an open container, its amount keeps on decreasing due to the phenomenon of

Heterogeneous mixture in which the solute particles do not dissolve and remain suspended throughout the solvent and the solute particles can be seen with the naked eye is known as:

In tincture of iodine, find the solute and solvent?

The continuous zig-zag movement of colloidal particles in a dispersion medium is called

A pure substance which is made up of only one kind of atom and cannot be broken into two or more simpler substances by physical or chemical means is referred to as

Which of the following non-metal is a good conductor of electricity?

Which of the following property does not describe a compound?

When two liquids do not mix, they form two separate layers and are known as

How one can separate ammonium chloride from a mixture containing ammonium chloride and sodium chloride?

The amount of solute present per unit volume or per unit mass of the solution/solvent is known as

According to the definition of pure substance, which of the following is a pure substance?

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