PRACTICE TEST 2-Class 10 – Science -Chemistry -Chapter 1

Welcome to your Ncert - class 10- science - Chapter 1 – Chemical Reactions and Equations 2

Identify the type reaction from the following.
$$H_{2}CO_{3}(aq)\rightarrow H_{2}O(l)+CO_{2}(g)$$

Combustion reaction

Displacement reaction

Decomposition reaction

Double displacement reaction

None

Balanced chemical equations imply which of the following?

I. Numbers of molecules are conserved in chemical change

II. Numbers of atoms are conserved in chemical change.

III. Mass is conserved in chemical change.

I and III only

II and III only

IIonly

I only

None

Identify the product(s) which will be formed by using the information provided about the reactants:
$$Al(s) + O_{2}(g) \rightarrow $$

$$Al_{3}O_{3}$$

$$Al_{3}O_{2}$$

$$Al_{2}O_{3}$$

$$Al_{2}O_{2}$$

None

Which information is not conveyed by a balanced chemical equation?

Symbols and formula of all the substance involved in a particular reaction

Whether a particular reaction is actually feasible or not

Physical state of reactants and products

Number of atoms/molecule of the reactants and products formed

None

Balancing of equations is based on:

Law of conservation of mass

Avogadro's number

Principle of conservation of momentum

Conditions for a chemical reaction to take place

None

Combustion reaction of coal is a/an __________ reaction.

None of these

auto-catalytic

endothermic

exothermic

None

Choose the incorrect statement

Combination of two different elements is possible.

Decomposition of a chemical compound into two new compounds is possible.

Decomposition of single compound is not possible.

A combination of an element with a compound to form a new product is possible.

None

Which of the following is not a characteristic of a chemical reaction?

None of the above

Formation of precipitate

Change in temperature

Change in color

None

Take 5 mL of sodium sulphate solution in a test tube and 5 mL of barium chloride solution in another test tube. Mix the two solutions slowly and leave the test tube undisturbed for some time. A white precipitate is formed after some time.

Which of the following statements is correct about the above reaction?

It is a displacement reaction since chloride ions are replaced by sulphate ions

It is a combination reaction since barium ions combine with sulphate ions to give barium sulphate.

It is a double displacement reaction since exchange of ions occurs between the two reactants.

It is a neutralisation reaction since an acid reacts with alkali to give a salt.

None

10.

You mix two colourless solutions and the resulting mixture becomes cloudy. What type of reaction is observed?

An acid base reaction

A physical reaction

A precipitation reaction

A redox reaction

None

11.

The color of the coating formed on the metals such as iron, silver, and copper after corrosion will be:

Black, brown and green in colour

Black in colour in all the metals

Brown, black and green in colour

Brown in colour in all the metals

None

12.

(i) Reaction between calcium oxide and water is a _______ reaction

(ii) Treatment of mercuric oxide with strong heat is a ________ reaction

Combination, Decomposition

Decomposition, Combination

Decomposition, Decomposition

Combination, Combination

None

13.

Study the following chemical reactions.
$$Fe+CuSO_{4}\rightarrow FeSO_{4}+Cu$$
$$
$$2AgNO_{3}+Cu\rightarrow Cu(NO_{3})_{2}+2Ag$$
The metals present in the reactions can be written in the increasing order of reactivity as:

Ag,Fe,Cu

Fe,Cu,Ag

Cu,Fe,Ag

Ag,Cu,Fe

None

14.

Which of the following pairs will give displacement reactions?

NaCl solution and copper metal

MgCl2 solution and aluminium metal

FeSO4 solution and silver metal

AgNO3 solution and copper metal.

None

15.

Which of the following process involves chemical reaction?

Compression of sponge

Cutting of tree

Formation of ice from water

Respiration

None

16.

Anhydrous iron (III) chloride is prepared by:

decomposition

combination

neutralization

displacement

None

17.

The mixture of carbon and sulphur is separated by using the solution of _________.

carbon dioxide

carbon monoxide

carbon disulphide

sulphur oxide

None

18.

When sodium hydroxide solution is added to copper sulfate solution, a blue precipitate of copper hydroxide is formed along with sodium sulfate solution. What kind of chemical reaction takes place between them?

Chemical double decomposition reaction

Chemical combination reaction

Chemical decomposition reaction

Chemical displacement reaction

None

19.

Chemical volcano is an example of:

combination reaction

decomposition reaction

none of the above

displacement reaaction

None

20.

Calcium oxide reacts vigorously with water to produce slaked lime.
$$CaO(s)+ H_{2}O(l)\rightarrow Ca(OH)_{2}(aq)+ heat$$
This reaction can be classified which of the following?

(A) Combination reaction

(B) Exothermic reaction

(D) Decomposition reaction

(A) and (B)

(A) and (C)

(A), (C) and (D)

None

Chapter 1 - Chemical Reaction and Equation

chapter 2- Acids, Bases and Salt

Chapter 3 – Metals and Non-metals

Chapter 4 – Carbon and its Compounds

Assertion and Reason chemistry

CASE BASED QUESTIONS

Curriculum

Ncert-Class 10 Science - Chemistry

Chapter 1 - Chemical Reaction and Equation

chapter 2- Acids, Bases and Salt

Chapter 3 – Metals and Non-metals

Chapter 4 – Carbon and its Compounds

Assertion and Reason chemistry

CASE BASED QUESTIONS

PRACTICE TEST 2-Class 10 – Science -Chemistry -Chapter 1 – Chemical Reaction and Equation