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

What type of reaction is represented by: A + BC → AC + B ?

oxidation reaction

replacement reaction

displacement reaction

none of these

2 / 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

3 / 15

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

O₂

NH₃

H₂O

4 / 15

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

CO₂

Fe₂O

5 / 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

6 / 15

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

chemical

physical

Both 1 & 2

none of these

7 / 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

8 / 15

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

chemical

physical

Both 1 & 2

none of these

9 / 15

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

endothermic reaction

exothermic reaction

Both 1 & 2

none of these

10 / 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

11 / 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 and 4

12 / 15

Which of the following reactions is an endothermic reaction?

Burning of coal.

Decomposition of vegetable matter into compost

Process of respiration.

Decomposition of calcium carbonate to form quick lime and carbon dioxide

13 / 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

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

Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of reaction involved?

Displacement reaction

Precipitation reaction

Combination reaction

Double displacement reaction

2 and 4

Your score is

Science : Ch 01 – Chemical Reactions and Equations

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