Science : Ch 01 – Chemical Reactions and Equations

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

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.

2 / 15

Why are anti-oxidants added to fat and oil containing food items?

To prevent oxidation

to increase oxidation

to prevent reduction

all of these

3 / 15

Why are oil and fat containing food items fushed with nitrogen while packing?

to prevent reduction

To prevent rancid

to increase oxidation

none of these

4 / 15

Identify the reducing agent in the following reactions 4NH₃ + 5O₂ → 4NO + 6H₂O

O₂

NH₃

NO

H₂O

5 / 15

Identify the reducing agent in the following reactions: 2H₂ + O₂ → 2H₂O

O

H2

H2O

H2

6 / 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.Name the type of reaction taking place.

double displacement reaction

single displacement reaction

double replacement reaction

all of these

7 / 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.Why does the colour of the solution fades?

due to its reaction with hydrogen sulphide gas and results into the formation of colourless solution of sulphuric acid.

due to its reaction with Copper sulphate gas and results into the formation of colourless solution of sulphuric acid.

Both 1 & 2

all of these

8 / 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

9 / 15

Mention whether it is physical or chemical changes:- Burning of Liquefied Petroleum Gas (LPG)

chemical

physical

Both 1 & 2

none of these

10 / 15

Mention whether it is physical or chemical changes : Heating of an iron rod to red hot

physical

chemical

Both 1 & 2

none of these

11 / 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

12 / 15

The following reaction is used for the preparation of oxygen gas in the laboratory: 2KClO₃(s) Heat ⎯ → Catalyst ⎯⎯⎯ 2KCl(s) + 3O₂(g) Which of the following statement(s) is/are correct about the reaction?

It is a decomposition reaction and endothermic in nature

It is a combination reaction

It is a decomposition reaction and accompanied by release of heat

It is a photochemical decomposition reaction and exothermic in nature

13 / 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)

14 / 15

Which of the subsequent does show an oxidation reaction

Gain of oxygen

Loss of oxygen

Gain of hydrogen

None of the above

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

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Science : Ch 01 – Chemical Reactions and Equations

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