Elements, compounds and mixtures Quiz - ICSE Class 7 Science
Free practice quiz: Elements, compounds and mixtures (ICSE Class 7 Science). 51 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
This ICSE Class 7 Science practice quiz has 51 multiple-choice questions on Elements, compounds and mixtures, and 51 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.
Start quiz: 51 questions, freeSample questions
Which of the following is an element that exists as a diatomic molecule at room temperature and pressure?
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Answer: C. Oxygen
Oxygen (O₂) is a diatomic molecule, meaning it exists as two oxygen atoms bonded together. Sulfur and phosphorus typically exist as polyatomic molecules (e.g., S₈, P₄), and carbon exists as single atoms in its elemental form (like graphite or diamond).
Which of the following is an example of a compound?
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Answer: C. Carbon dioxide
Carbon dioxide (CO₂) is formed by the chemical combination of carbon and oxygen in a fixed ratio. Air is a mixture of gases, bronze is an alloy (a mixture of metals), and milk is a complex mixture.
Which of the following is an example of a homogeneous mixture?
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Answer: C. Steel
Steel is an alloy, which is a solid solution of metals (primarily iron and carbon). Its components are evenly mixed. Vegetable soup, salad dressing, and soil are all heterogeneous mixtures with non-uniform composition.
Which separation technique is based on the difference in solubility of components in a solvent?
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Answer: C. Crystallization
Crystallization is a process where a solid forms crystals from a solution, melt, or gas. It's often used to purify compounds and relies on the difference in solubility of the compound and impurities at different temperatures.
The separation of dissolved solids from a liquid by heating the liquid to vaporize it and then cooling the vapor to condense it back into liquid form is known as:
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Answer: C. Distillation
This process accurately describes distillation, which is used to separate substances based on their different boiling points.
More questions in this quiz
Answers and explanations are in the full quiz.
- A substance formed when two or more elements are chemically combined in a fixed ratio is called a:
- Which of the following is an example of a heterogeneous mixture?
- The process of separating insoluble solids from a liquid by pouring the liquid through a filter medium is known as:
- Which of the following elements has the symbol 'Au'?
- Water (H₂O) is an example of a:
- Which of these is a property of a homogeneous mixture?
- The separation technique used to obtain salt from saltwater is:
- Which element has the chemical symbol 'Fe'?
- A substance that is made up of only one type of atom is called:
- What is the primary characteristic that distinguishes a heterogeneous mixture from a homogeneous mixture?
- The process of separating dissolved solids from a liquid by boiling the liquid and then condensing the vapor is called:
- Which element's chemical symbol is 'Na'?
- A pure substance that cannot be broken down into simpler substances by chemical means is known as:
- When salt is dissolved in water, a ______ is formed.
- Which of the following is NOT a compound?
- Which separation technique is most suitable for separating a mixture of iron filings and sulfur powder?
- Which element has the symbol 'K'?
- The chemical formula for common salt is NaCl. This indicates that salt is a:
- Which separation technique is used to separate a mixture of sand and water after the sand has settled to the bottom?
- The chemical symbol 'O' represents which element?
- Carbon dioxide (CO₂) is composed of carbon and oxygen atoms chemically bonded in a fixed ratio. This makes carbon dioxide a:
- Which of the following is NOT a homogeneous mixture?
- The process of separating components of a mixture by their differing boiling points is called:
- Which element has the chemical symbol 'Al'?
- A substance composed of two or more elements that are physically mixed but not chemically bonded is called a:
- The chemical formula for glucose is C₆H₁₂O₆. This formula tells us that glucose is a:
- Which of these is an example of a suspension, a type of heterogeneous mixture where particles settle out over time?
- Which element has the chemical symbol 'H'?
- A pure substance consisting of only one kind of atom is called:
- When sugar is dissolved in water, it forms a ______ because the sugar is evenly distributed throughout the water.
- Which of the following is a compound with the chemical formula CO?
- Which separation technique is ideal for separating fine insoluble solids from a liquid when the solid particles are very small?
- Which element has the chemical symbol 'Cl'?
- Which of the following is a pure substance?
- What is the chemical formula for water?
- An example of a gaseous homogeneous mixture is:
- Which element's symbol is 'Ca'?
- The chemical formula for common table salt is NaCl. This signifies that salt is a:
- Which of the following is an example of a substance that sublimes (changes directly from solid to gas)?
- A mixture where the components are not uniformly distributed and can be seen as separate parts is called:
- The separation method used to separate sand from water using a permeable barrier is:
- Which element has the chemical symbol 'Cu'?
- Which of the following is a compound containing carbon?
- A substance that is made up of only one type of atom, found on the periodic table, is called:
- Which of the following is a characteristic of a compound?
- Which of the following is NOT a separation technique for mixtures?
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