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

Identify the reducing agent in the following reactions: 2H₂O + 2F₂ → 4HF + O₂

H₂O

F₂

HF

O₂

3 / 15

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

CO

Fe

CO₂

Fe₂O

4 / 15

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

O

H2

H2O

H2

5 / 15

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

physical

chemical

Both 1 & 2

none of these

6 / 15

Mention whether it is physical or chemical changes :Curdling of milk

chemical

physical

Both 1 & 2

none of these

7 / 15

State the reactions are exothermic or endothermic in nature: Decomposition of ferrous sulphate

endothermic reaction

exothermic reaction

Both 1 & 2

all of these

8 / 15

In the electrolysis of water, name the gases liberated at anode

H2O

Oxygen

Hydrogen

None of these

9 / 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 (NO2) 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

10 / 15

Which of the subsequent is (are) an endothermic process(es)?

Dilution of sulphuric acid

Sublimation of dry ice

Condensation of water vapours

Evaporation of water

1 and 2

2

3

2 and 4

11 / 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

12 / 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.

13 / 15

One of the following processess doesnot require a chemical reaction:

Melting of candle wax when heated

Burning of candle wax when heated

Digestion of food in your stomach

Ripening of banana

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

Which of the following are combination reactions?

KClO₃ →^(Heat)→ 2KCl + 3O₂

MgO + H₂O → Mg(OH)₂

4Al + 3O₂ → 2Al2O₃

Zn + FeSO₄ →ZnSO₄ + Fe

1 and 4

3 and 4

2 and 4

2 and 3

Your score is

0%

Science : Ch 01 – Chemical Reactions and Equations

Archives

Categories