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CBSE Class 10 Science Worksheet

Unit I: Chemical Substances - Nature and Behaviour - Chemical Reactions and Equations

1.

Combination reactions are opposite to decomposition reactions

A) True B) False
2.
Fill in the blanks: Sulphur dioxide gas when passed through acidic potassium permanganate solution (purple in colour) turns it colourless because of formation of ___________
3.

What observations help us to know if a chemical reaction has taken place or not?

A)

Change in state

 B)

Change in colour

 C)

Evolution of gas

 D)

Change in temperature
4.
Fill in the blanks: A substance is said to be oxidised if it loses ____________ during reaction.
5.
Fill in the blanks: A substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction is called ________.
6.
Which of the following is an example of redox reactions?
A) Rusting of iron B) Burning of coals C) Both of 1 and 2 D) None of these
7.

Q2. In a reaction between zinc and hydrochloric acid, the changes accompanying a reaction are

A)

Evolution of gas and heat

 B)

Evolution of steam

 C)

Formation of precipitate

 D)

Formation of dazzling white light
8.
Ethanol is warmed with ethanoic acid to form ethyl acetate in the presence of concentrated sulphuric acid. Identify the type of reaction.
A) Displacement reaction B) Double displacement reaction C) Decomposition reaction D) Combination reaction
9.
Which gas is present in flush bags of chips to prevent the chips from getting oxidised?
A) Oxygen B) Nitrogen C) Hydrogen D) Carbon Dioxide
10.
Fill in the blanks: Water containing calcium ions is called ______________
11.

Combination reactions are endothermic in nature

A) True B) False
12.
The reaction between calcium chloride and potassium hydroxide, resulting in the formation of calcium hydroxide and potassium chloride. Which of the following
correctly represents the type of the reaction involved? (i)Displacement reaction

(ii) Precipitation reaction

(iii) Combination reaction

(iv) Double displacement reaction
A) (i) and (ii) B) (ii) and (iv) C) (i) and (iii) D) (iii) and (iv)
13.
Which gas turns lime water to milky when it is passed through it?
A) Oxygen B) Hydrogen C) Sulphur Dioxide D) Carbon Dioxide
14.

1. Why is respiration considered an exothermic process ?

15.

Which of the following nitrogen oxides do not contain N-N bonds

A)

N2O5

 B)

N2O4

 C)

N2O

 D)

None of these
16.
What would be the colour of silver chloride when it is put in sunlight?
A) Blue B) Yellow C) Grey D) White
17.
State TRUE/FALSE: pH range of acid is more than 7.
A) TRUE B) FALSE
18.
Ferrous sulphate decomposes with the evolution of a gas having a characteristic odour of burning sulphur. Identify the gas evolved.
A) Nitrogen B) Oxygen C) Sulphur Dioxide D) Hydrogen
19.

Which of the above solution(s) can be stored in a container made of any of these
metals?

A)

Aluminium sulphates

 B)

Magnesium sulphates

 C)

Both (a) & (b)

 D)

None of these
20.

The oxide of nitrogen N2O5 do not contain N-N bond

A) True B) False

CBSE Class 10 Science Worksheet

Unit I: Chemical Substances - Nature and Behaviour - Chemical Reactions and Equations

Answers

1.
Option A

2.
Potassium sulphate
3.
Option A

4.
Hydrogen
5.
Catalyst
6.
Option C
7.
Option A
8.
Option B
9.
Option B

10.
Hard water
11.
Option B
12.
Option B
13.
Option D
15.
Option A
16.
Option C
17.
Option B
18.
Option C
19.
Option C
20.
Option A
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