Science : Ch 01 – Chemical Reactions and Equations

Notes

This quiz contains 10 question from Chapter 1 – Chemical Reactions and Equations
Each question carry one mark
You can practice the quiz till the time you are prefect.

Science : Ch 01 - Chemical Reactions and Equations

This test is designed based on NCERT Syllabus for Class 10 Topics : Chemical Reactions and Equations

Each time random 15 questions will be displaced
So retake the quiz till you have mastered all the questions

1 / 15

Give an example of decomposition reaction taking place in our body.

reproduction

digestion

blood circulation

respiration

2 / 15

What happens when sodium sulphate solution is added to barium chloride solution?

a red precipitate of barium sulphate is formed.

a white precipitate of barium chloride is formed.

a white precipitate of barium sulphate is formed.

3 / 15

Identify the reducing agent in the following reactions: Fe₂O₃ + 3CO → 2Fe + 3CO₂

CO₂

Fe₂O

4 / 15

When hydrogen sulphide gas is passed through a blue solution of copper sulphate, the colour of the solution fades and a black precipitate is obtained.Write the chemical name of the black precipitate formed.

hydrogen sulphide

copper sulphide.

hydrogen sulphate

none of these

5 / 15

Mention whether it is a physical or chemical changes: -Evaporation of petrol

physical

chemical

Both 1 & 2

none of these

6 / 15

State the reactions exothermic or endothermic in nature: Dilution of sulphuric acid

endothermic reaction

exothermic reaction

Both 1 & 2

none of these

7 / 15

On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide (black), oxygen gas and a brown gas X is formed. Identify the brown gas X evolved.

X is nitrogen dioxide gas (NO<sub>2</sub>) that has evolved as brown, choking fumes

X is copper oxide gas that has evolved as brown, choking fumes

X is oxygen gas that has evolved as brown, choking fumes.

none of these

8 / 15

Solid calcium oxide reacts vigorously with water to form calcium hydroxide, accompanied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form a solution called lime water. Which among the following is (are) true about slaking of lime and the solution formed?

It is an endothermic reaction

It is an exothermic reaction.

The pH of the resulting solution will be more than seven.

The pH of the resulting solution will be less than seven

1 and 2

2 and 3

1 and 4

3 and 4

9 / 15

Which of the following is not a physical change?

Boiling of water to give water vapour

Melting of ice to give water

Dissolution of salt in water

Combustion of Liquefed Petroleum Gas

10 / 15

Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during the electrolysis of water is:

1:01

2:01

4:01

1:02

11 / 15

Strong heating of ferrous sulphate leads to the formation of a brown solid and two gases. This reaction can be designated as:

displacement and redox

decomposition and redox

displacement and endothermic

decomposition and exothermic.

12 / 15

which of the subsequent chemical equations do the abbreviations represent the correct states of the reactants and products involved at reaction temperature?

2H₂(l) + O₂(l) → 2H₂O(g)

2H₂(g) + O₂(l) → 2H₂O(g)

2H₂(g) + O₂(g) → 2H₂O(l)

2H₂(g) + O₂(g) → 2H₂O(g)

13 / 15

One of the following does not happen during a chemical reaction.

Breaking of old chemical bonds and formation of new chemical bonds

Formation of new substances with entirely diferent properties

Atoms of one element change into those of another element to form new products

A rearrangement of atoms takes place to form new products

14 / 15

Dilute hydrochloric acid is added to granulated zinc taken in a test tube. The following observations are recorded. Designate the accurate observation:

The surface of metal becomes shiny.

The reaction mixture turns milky.

Odour of a pungent smelling gas is recorded.

A colourless and odourless gas is evolved

15 / 15

The following reaction is an example of a: 4NH₃(g) + 5O₂(g) → 4NO(g) + 6H₂O(g)

Displacement reaction

Combination reaction

Redox reaction

Neutralisation reaction

1 and 4

2 and 3

1 and 3

3 and 4

Your score is

Science : Ch 01 – Chemical Reactions and Equations

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