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

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

Which information is not conveyed by a balanced chemical equation?

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

Number of atoms/molecule of the reactants and products formed

Whether a particular reaction is actually feasible or not

Physical state of reactants and products

None

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

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

Cu,Fe,Ag

Fe,Cu,Ag

Ag,Cu,Fe

None

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

Change in temperature

None of the above

Formation of precipitate

Change in color

None

Anhydrous iron (III) chloride is prepared by:

combination

decomposition

neutralization

displacement

None

Choose the incorrect statement

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

Decomposition of single compound is not possible.

Combination of two different elements is possible.

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

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

I only

IIonly

None

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 combination reaction

Chemical double decomposition reaction

Chemical decomposition reaction

Chemical displacement reaction

None

Which of the following process involves chemical reaction?

Cutting of tree

Compression of sponge

Respiration

Formation of ice from water

None

10.

Chemical volcano is an example of:

decomposition reaction

combination reaction

displacement reaaction

none of the above

None

11.

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

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

Decomposition, Decomposition

Decomposition, Combination

Combination, Combination

Combination, Decomposition

None

12.

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

Brown in colour in all the metals

Black, brown and green in colour

Black in colour in all the metals

Brown, black and green in colour

None

13.

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

carbon dioxide

carbon monoxide

sulphur oxide

carbon disulphide

None

14.

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

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

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

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

None

15.

Combustion reaction of coal is a/an __________ reaction.

auto-catalytic

endothermic

exothermic

None of these

None

16.

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

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

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

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

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

None

17.

Balancing of equations is based on:

Principle of conservation of momentum

Conditions for a chemical reaction to take place

Law of conservation of mass

Avogadro's number

None

18.

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), (C) and (D)

(A) and (C)

None

19.

Which of the following pairs will give displacement reactions?

MgCl2 solution and aluminium metal

NaCl solution and copper metal

FeSO4 solution and silver metal

AgNO3 solution and copper metal.

None

20.

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

A redox reaction

A physical reaction

A precipitation reaction

An acid base reaction

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