Chapter 5 Chemical Reactions Science 8th Class Punjab MCQ Tests
8th Class Science Chapter 5 MCQ Tests
Chapter 5 of 8th Class Science has 25 questions. If you take an online MCQ test, the system will randomly choose the questions. If you want to take the quiz by chapter then click the start test button.
Total Questions: 25
Total Marks: 25
Time: 25 Mins
Total Questions: 25
Total Marks: 25
Time: 25 Mins
25Min : 00 Sec Remaining
Question # 1
When energy is released:
Question # 2
Which chemical equation correctly represents the decomposition reaction that takes place when ammonia breaks down to form hydrogen gas and nitrogen gas?
Question # 3
SI unit of measuring enthalpy is _____.
Question # 4
In a chemical reaction, 300 grams of reactant A are combined with 100 grams of reactant B. Both A and B react to completion. How much will the product weigh?
Question # 5
If Δ H value is less than zero, the reaction will be _____.
Question # 6
According to Law of Conservation of mass, there is_____ of mass.
Question # 7
In a reaction, 25 grams of reactant AB breaks down into 10 grams of product A and an unknown amount of product B. Using the law of conservation of mass, how much does product B weigh?
Question # 8
Which law is fulfilled for writing the following chemical equation?
Question # 9
Chemical changes are basically the chemical reactions which are:
Question # 10
Although mass cannot be created, but it reduces when a chemical reaction takes place. State whether the given statement is true or false.
Question # 11
A reaction in which a substance reacts with oxygen gas is known as _____.
Question # 12
During breathing process which gas is made to be inhaled in the body;
Question # 13
Question # 14
Balance the following chemical equation:
Question # 15
When heat is absorbed by the system:
Question # 16
A mixture containing 50 grams of carbon and 75 grams of oxygen is sealed in a flask. The total mass of the system is 225 grams. The flask is heated to cause the carbon and oxygen to react. The sealed flask is weighed. What is the mass of the sealed flask?
Question # 17
A combustion reaction _____.
Question # 18
The number in front of a chemical formula in a chemical equation is _____.
Question # 19
Balance chemical equation:
Question # 20
Change which is not accompanied by formation of new substance is called a
Question # 21
Photosynthesis is an example of _____.
Question # 22
What is incorrect about the law of conservation of mass?
Question # 23
Decomposition reactions make _______ compounds.
Question # 24
Chemical reaction is done when one of the following process occurs.
Question # 25
The reaction CaCO3 → CaO + CO2 is an example of _____.
Total Questions
12345678910111213141516171819202122232425
Question # 1
When energy is released:
Question # 2
Which chemical equation correctly represents the decomposition reaction that takes place when ammonia breaks down to form hydrogen gas and nitrogen gas?
Question # 3
SI unit of measuring enthalpy is _____.
Question # 4
In a chemical reaction, 300 grams of reactant A are combined with 100 grams of reactant B. Both A and B react to completion. How much will the product weigh?
Question # 5
If Δ H value is less than zero, the reaction will be _____.
Question # 6
According to Law of Conservation of mass, there is_____ of mass.
Question # 7
In a reaction, 25 grams of reactant AB breaks down into 10 grams of product A and an unknown amount of product B. Using the law of conservation of mass, how much does product B weigh?
Question # 8
Which law is fulfilled for writing the following chemical equation?
Question # 9
Chemical changes are basically the chemical reactions which are:
Question # 10
Although mass cannot be created, but it reduces when a chemical reaction takes place. State whether the given statement is true or false.
Question # 11
A reaction in which a substance reacts with oxygen gas is known as _____.
Question # 12
During breathing process which gas is made to be inhaled in the body;
Question # 13
Question # 14
Balance the following chemical equation:
Question # 15
When heat is absorbed by the system:
Question # 16
A mixture containing 50 grams of carbon and 75 grams of oxygen is sealed in a flask. The total mass of the system is 225 grams. The flask is heated to cause the carbon and oxygen to react. The sealed flask is weighed. What is the mass of the sealed flask?
Question # 17
A combustion reaction _____.
Question # 18
The number in front of a chemical formula in a chemical equation is _____.
Question # 19
Balance chemical equation:
Question # 20
Change which is not accompanied by formation of new substance is called a
Question # 21
Photosynthesis is an example of _____.
Question # 22
What is incorrect about the law of conservation of mass?
Question # 23
Decomposition reactions make _______ compounds.
Question # 24
Chemical reaction is done when one of the following process occurs.
Question # 25
The reaction CaCO3 → CaO + CO2 is an example of _____.
Total Questions
12345678910111213141516171819202122232425
Science MCQ Test by Topics
- +5.1 Chemical Reactions
- +5.1.1 Applications of Chemical Reactions
- +5.2 Chemical Equations and their Balancing
- +5.2.1 Balancing the Chemical Equation
- +5.3 Law of Conservation of Mass (Matter)
- +5.4 Types of Chemical Reactions
- +5.4.1 Addition Reactions
- +5.4.2 Decomposition Reactions
- +5.5 Energy Changes in Chemical Reactions
- +5.5.1 Exothermic Reactions
- +5.5.2 Endothermic Reactions
- +5.5.3 Importance of Exothermic Reactions in Daily Life
Science
8th Class Punjab MCQ Tests
8th Class Online Classes 2026
Updated on: 21-05-2026
8th Class Online Preparation
8th Class 2026 Online
8th Class 2026
Add a Comment
Comments will be shown after admin approval.
Spam comments will not be approved at all.
Matric Result 2026 Punjab
10th Class Result 2026 Punjab
9th Class Result 2026 Punjab Boards
10th Class Result Gazette 2026 Punjab
Punjab Past Papers Matric 9th 10th
Primary Results 5th & 8th Class
BISE Results Intermediate & Matric
BISE Punjab Boards
Sindh Educational Boards
KPK Examination Boards
Technical Boards
Public Service Commission
University Results Gruaduation, Masters Classes
Subscribe by Email
Subscribe by Email
Subscribe to Rss Feed
Position Holders Matric 2026
Position Holders 9th Class 2026
Position Holders Inter 2026
Position Holders 11th Class 2026
Punjab 8th Class Science