Free Printable IS MATTER AROUND US PURE

1.

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

a)

(a) (i) and (ii)

b)

(b) (i) and (iii)

c)

(c) (iii) and (iv)

d)

(d) (ii) and (iii)

2.

Rusting of an article made up of iron is called

a)

(a) corrosion and it is a physical as well as chemical change

b)

(b) dissolution and it is a physical change

c)

(c) corrosion and it is a chemical change

d)

(d) dissolution and it is a chemical change

3.

A mixture of sulphur and carbon disulphide is

a)

(a) heterogeneous and shows Tyndall effect

b)

(b) homogeneous and shows Tyndall effect

c)

(c) heterogeneous and does not show Tyndall effect

d)

(d) homogeneous and does not show Tyndall effect

4.

Tincture of iodine has antiseptic properties. This solution is made by

dissolving

a)

(a) iodine in potassium iodide

b)

(b) iodine in vaseline

c)

(c) iodine in water

d)

(d) iodine in alcohol

5.

Which of the following are homogeneous in nature?

(i) ice (ii) wood (iii) soil (iv) air

a)

(a) (i) and (iii)

b)

(b) (ii) and (iv)

c)

(c) (i) and (iv)

d)

(d) (iii) and (iv)

6.

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

a)

(a) (i), (ii) and (iii)

b)

(b) (i), (ii) and (iv)

c)

(c) (i), (iii) and (iv)

d)

(d) (ii), (iii) and (iv)

7.

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

a)

(a) (i) and (ii)

b)

(b) (ii) and (iii)

c)

(c) (iii) and (iv)

d)

(d) (i) and (iv)

8.

Two substances, A and B were made to react to form a third substance,
A2B according to the following reaction
2 A + B $\rightarrow$ A2 B
Which of the following statements concerning this reaction are incorrect?
(i) The product A2B shows the properties of substances A and B
(ii) The product will always have a fixed composition
(iii) The product so formed cannot be classified as a compound
(iv) The product so formed is an element

a)

(a) (i), (ii) and (iii),

b)

(b) (ii), (iii) and (iv)

c)

(c) (i), (iii) and (iv)

d)

(d) (ii), (iii) and (iv)

9.

Two chemical species X and Y combine together to form a product P which contains both X and Y
X + Y $\rightarrow$ P
X and Y cannot be broken down into simpler substances by simple chemical
reactions. Which of the following concerning the species X, Y and P are correct?
(i) P is a compound
(ii) X and Y are compound
(iii) X and Y are elements
(iv) P has a fixed composition

a)

(a) (i), (ii) and (iii),

b)

(b) (i), (ii) and (iv)

c)

(c) (ii), (iii) and (iv)

d)

(d) (i), (iii) and (iv)

10.

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

a)

(a) Sodium

b)

(b) Potassium

c)

(c) Mercury

d)

(d) Bromine

11.

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:

a)

(a) Centrifugation

b)

(b) Fractional distillation

c)

(c) Evaporation

d)

(d) Tunneling

12.

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

a)

(a) Mercury

b)

(b) Bromine

c)

(c) Sodium

d)

(d) Potassium

13.

Which of the following elements is not a metalloid?

a)

(a) Boron

b)

(b) Silicon

c)

(c) Germanium

d)

(d) Tungsten

14.

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

a)

(a) Evaporation

b)

(b) Precipitation

c)

(c) Condensation

d)

(d) Sublimation

15.

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:

a)

(a) Colloidal solution

b)

(b) Super saturated solution

c)

(c) Sublimation

d)

(d) Suspensions

16.

In tincture of iodine, find the solute and solvent?

a)

(a) alcohol is the solute and iodine is the solvent

b)

(b) iodine is the solute and alcohol is the solvent

c)

(c) any component can be considered as solute or solvent

d)

(d) tincture of iodine is not a solution

17.

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

a)

(a) Dispersion

b)

(b) Tyndall effect

c)

(c) Brownian movement

d)

(d) Oscillation

18.

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

a)

(a) a compound

b)

(b) an element

c)

(c) a molecule

d)

(d) a mixture

19.

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

a)

(a) Aluminium

b)

(b) Silicon

c)

(c) Graphite

d)

(d) Gold

20.

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

a)

(a) Miscible liquids

b)

(b) Immiscible liquids

c)

(c) Saturated liquids

d)

(d) Super saturated liquids

21.

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

a)

(a) Precipitation

b)

(b) Sublimation

c)

(c) Chromatography

d)

(d) Cetrifugation

22.

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

a)

(a) Composition of solute

b)

(b) Concentration of a solvent

c)

(c) Concentration of a solute

d)

(d) Concentration of a solution

23.

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

a)

(a) Ice

b)

(b) Mercury

c)

(c) Iron

d)

(d) All of these

24.

Which of the following property does not describe a compound?

a)

(a) It is composed of two or more elements

b)

(b) It is a pure substance.

c)

(c) It cannot be separated into constituents by physical means

d)

(d) It is mixed in any proportion by mass

IS MATTER AROUND US PURE

Total questions: 24

Worksheet time: 46mins

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