Elements, Compounds and Mixtures Quiz - ICSE Class 8 Science

Free practice quiz: Elements, Compounds and Mixtures (ICSE Class 8 Science). 50 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 8 Science practice quiz has 50 multiple-choice questions on Elements, Compounds and Mixtures, and 50 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which of the following is a pure substance that cannot be broken down into simpler substances by chemical means?

   1. Compound
   2. Element
   3. Mixture
   4. Solution
   Show answer

   Answer: B. Element

   An element is defined as a pure substance consisting only of atoms that all have the same number of protons in their atomic nuclei. It cannot be broken down into simpler substances by chemical means. Compounds are formed from two or more elements chemically bonded, and mixtures are physical combinations of substances.

2. Which of the following is NOT a physical property of metals?

   1. Good conductors of heat and electricity
   2. Malleable
   3. Ductile
   4. Dull appearance
   Show answer

   Answer: D. Dull appearance

   Most metals have a shiny (lustrous) appearance. They are generally good conductors of heat and electricity, malleable (can be hammered into thin sheets), and ductile (can be drawn into wires).

3. Which of the following is a compound made up of only one type of atom?

   1. Water
   2. Salt
   3. Oxygen gas (O2)
   4. Carbon dioxide
   Show answer

   Answer: C. Oxygen gas (O2)

   Oxygen gas (O2) is made up of two oxygen atoms bonded together, but it is still considered an element because it consists of only one type of atom. Water, salt, and carbon dioxide are compounds made of different types of atoms.

4. Which of the following is a property of gases?

   1. They have a definite shape and volume.
   2. They have a definite volume but take the shape of their container.
   3. They have no definite shape or volume and fill the entire container.
   4. They are generally incompressible.
   Show answer

   Answer: C. They have no definite shape or volume and fill the entire container.

   Gases have particles that are far apart and move randomly, meaning they have neither a fixed shape nor a fixed volume. They expand to fill any container they are in.

5. Which of the following is a characteristic of ionic compounds?

   1. They have low melting and boiling points.
   2. They conduct electricity in the solid state.
   3. They are generally soluble in water.
   4. They are formed by sharing of electrons.
   Show answer

   Answer: C. They are generally soluble in water.

   Many ionic compounds are soluble in water, a polar solvent, due to the electrostatic attraction between the ions and the polar water molecules. Ionic compounds typically have high melting and boiling points, conduct electricity when molten or dissolved in water (because the ions are free to move), and are formed by the transfer of electrons, not sharing.

More questions in this quiz

Answers and explanations are in the full quiz.

1. When two or more elements combine chemically in a fixed ratio, what is formed?
2. A substance that is composed of two or more different substances that are not chemically bonded is called a:
3. Which of the following is an example of a homogeneous mixture?
4. Which of the following is an example of a heterogeneous mixture?
5. What is the chemical symbol for the element oxygen?
6. Which element has the chemical symbol 'Au'?
7. Water (H2O) is an example of:
8. Carbon dioxide (CO2) is formed from which two elements?
9. Which of these is a metalloid?
10. Which of the following is a characteristic property of nonmetals?
11. When a solid substance changes directly into a gas without passing through the liquid state, the process is called:
12. Which separation technique is most suitable for separating sand from water?
13. Which separation technique is used to separate a dissolved solid from a liquid by heating the solution to vaporize the liquid and then cooling the vapor to condense it back into liquid?
14. The process of separating a solvent from a solution by evaporating the solvent and then condensing it is called:
15. Which technique is used to separate different colored dyes in ink?
16. What is the atomic number of Carbon (C)?
17. The chemical formula for common salt is:
18. An atom of sodium (Na) has 11 protons. How many electrons does a neutral sodium atom have?
19. Which element is essential for respiration and is represented by the symbol O?
20. What type of substance is granite?
21. Which of the following pairs represents elements that form a covalent compound?
22. What is the primary characteristic that distinguishes an element from a compound?
23. Which of these is an alloy?
24. Which of the following processes is a chemical change?
25. What is the result of dissolving salt in water?
26. The chemical symbol Fe represents which element?
27. A molecule of hydrogen gas is represented by which formula?
28. Separating iron filings from sulfur powder can be done using a magnet because:
29. The process of turning a liquid into a solid is called:
30. Which of these substances is an element?
31. When a solid is heated and it directly turns into a gas, this is called:
32. Which of the following is a characteristic of a solution?
33. The element with the atomic number 8 is:
34. Which of the following is a chemical property?
35. Which of these is NOT an allotrope of carbon?
36. A substance that is made up of two or more elements chemically combined in a fixed ratio is called a:
37. The process of separating a solid from a liquid in which the solid is insoluble by passing the mixture through a filter is called:
38. Which element has the symbol 'K'?
39. Which of the following is an example of a substance that undergoes sublimation?
40. What is the chemical formula for common table salt?
41. Which statement best describes a compound?
42. Which of the following is a characteristic of nonmetals?
43. The separation of ink into its component colors using a solvent and a stationary phase is an example of:
44. Which element has the chemical symbol 'S'?
45. When a liquid is converted into a gas by heating, the process is called:

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