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1. The image shows two solutions.

What differentiates a homogeneous mixture from a heterogeneous mixture? [CBSE T.E.R.M*]

Mixture 2 is homogeneous because the components of a homogenous mixture always form separate layers.

Mixture 1 is homogeneous because the composition is uniform throughout the mixture.

Mixture 2 is heterogeneous because the components of a heterogeneous mixtures are always liquid.

Mixture 1 is heterogeneous because the components of the mixture are not visible from the naked eye.

2. Which of the following are signs of chemical change?

One or more new substance is formed

Energy is taken in or given out

The change is usually difficult to reverse

All of these

3. Which of the following can be classified as a mixture? [CBSE T.E.R.M*]

a clear white salt solution

A rusted iron nail

piece of paper cut into different shapes

A bowl of water with floating ice-cubes

4. Which of the following contains a mixture, an element and a compound respectively

Soil, Calcium, Sugar

Air, Sea water, Ammonia

Sulphur, Water, Sodium Chloride

Magnesium, Carbon dioxide, Aluminium

5. A student adds 5g of sugar in 100ml of water. The student stirs the contents for 2 minutes. After some time student notices a clear solution. Why the student is unable to see sugar particles?

They are colourless

They settle at the bottom

They are too small to be seen

They evaporate when added to water

6. Which physical property is being determined by the diagram?

Melting point

Boiling point

Density

Solubility

7. A student made models using gumballs. Which model would represent an element?

8. Which of the following is true about FeS ?

It is attracted by magnet

It is soluble in carbon disulphide

It gives H2S gas on reaction with dil. H2SO4

It is yellow in colour

9. Which of the following statement is false?

When compounds are formed, heat is often given off.

Unlike elements, compounds and mixtures are both impure substances

Unlike compounds, mixtures can be separated by physical methods.

Compounds and mixtures both can be made of elements.

10. A student is asked to make a homogeneous mixture. He is provided with the following substances. [CBSE T.E.R.M*]

A. Water

B. Soil

C. Milk

D. Chocolate Powder

E. Salt

Which two substances should the student mix

to form a homogeneous mixture?

A and B

C and D

B and E

A and E

11. Which one is Colloid?

Sugar solution

Milk

Wheat flour in water

All of these

12. Mixing of iron powder and sulphur is a

Physical change

Chemical change

Irreversible process

Exothermic process

13.

Which of the following is an example of gas is liquid mixture?

air

Aerated water (Soda water)

Alcohol and water

Amalgamated Zinc

14. 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

(i) and (ii)

(ii) and (iii)

(iii) and (iv)

(i) and (iv)

15. Chemical changes lead to formation of

Element

Compounds

Mixture

Any of these

16. Which of the following is true?

Compounds have fixed composition

The properties of compounds are similar to its components

Compound can be prepared by physical method

No heat is evolved or absorbed in the formation of compound.

17. The name of protein present in milk is

casein

albumin

soyabean

keratin.

18. Which of the following processes are regarded as physical changes?

Melting

Evaporation

Dissolving salt in water

All of these

19. Which of the following cannot be broken into simpler substances?

Methane and Nitrogen

Boron and H2

Oxygen and H2

Methane and glucose

20. The table lists properties of substance X.

1. It has fixed composition throughout the substance.

2. Its properties are different from its constituents.

3. It can be divided into smaller parts by chemical methods.

4. It is made of two different kind of atoms.

5. It exists as solid at room temperature

What can substance X be classified as? [CBSE T.E.R.M*]

Element, because it has different properties.

Element, because it can be divided into smaller parts.

Compound, because it can change from one form to another.

Compound, because it is made of two kinds of atoms joined in definite proportion.

21. A pure substance/element contains

two or more types of particles

one type of particles

many types of particles

two or more forms of matter.

22. The graph shows the concentration of carbon dioxide in air. Which of the following does not contribute to the rise in CO₂ concentration?

An increase in number of vehicles on the road.

An increase in number of activity in power stations.

An increase in rate of deforestation

An increase in usage of electric cars

23. A student filled two glasses with 100 mL water in each. To glass 1, she added 5 mL orange food colour, and to glass 2 she added 10 mL orange

food colour. Which water would appear darker of the two? [CBSE T.E.R.M*]

Glass 1 because it has less solute

Glass 2 because it has more solute

Glass 1 because it has more solvent

Glass 2 because it has more solvent

24.

Two substances, A and B were made to react to form a third substance, A₂B according to the following reaction

2A + B → A2B

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.

(i), (ii) and (iii)

(ii), (iii) and (iv)

(i), (iii) and (iv)

(ii), (iii) and (iv)

25. Which of the following is incorrect physical change?

New substance is formed.

Reversible

No or little heat is involved.

No new substance is formed.

26. Which of the following is not true about sulphur?

It is yellow coloured solid

It has low melting point

It is soluble in CS2

It is soluble in water

27. When iron filings and Sulphur powder is heated strongly in a china dish black iron sulphide is formed. The process is

Physical change

Chemical change

Reversible process

Exothermic process (heat is evolved)

28. A student crushed a piece of chalk and mixed the chalk powder in 100 mL water. The water appeared white and cloudy. After some time the

particles settled at the bottom of the container. She claims that the mixture is a suspension. What justifies her claim? [CBSE T.E.R.M*]

The particles mix completely with water.

The particles of chalk form a separate layer.

The particles of chalk are visible through the naked eye.

The particles of chalk are uniformly distributed in water.

29. The common characteristic of suspension and colloidal solution is

both are heterogeneous.

the particles of both can pass through filter paper.

the particles of both are visible to naked eye.

the particles do not settle at the bottom under gravity.

30.

Two chemical species X and Y combine together to form a product P which contains both X and Y

X + Y → 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 compounds

(iii) X and Y are elements

(iv) P has a fixed composition

(i), (ii) and (iii)

(i), (ii) and (iv)

(ii), (iii) and (iv)

(i), (iii) and (iv)

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