Two substances, A and B were made to react to form a third substance, A2B according to the following reaction 2 A + B → A2B. Which of the following statements concerning this reaction are incorrect?

A2B is a compound made up of two elements A and B in a fixed ratio. The properties of a compound (e.g. A2B) are entirely different from those of its constituent elements (e.g. A and B). The composition of a compound is fixed.

The rusting of an iron object is called:

Rusting of iron takes place in the presence of air (O2) and water vapour. Action of air and moisture on iron converts it to its oxide. This process is called corrosion and it leads to the formation of a new compound. Therefore, it is a chemical change.

Anushka is completed her science chapter where she wrote some statements. She wants to know whether the statements are correct or not? Anushka wants to take help from you:

Here, all these statements are correct. Hence your answer will be option [D].

A mixture of sulphur and carbon disulphide is:

Sulphur dissolves completely in carbon disulphide. So, it forms a homogeneous solution. As the particles of solute are too small to scatter light, they will not cause tyndall effect.

Which of the following statement is or are correct?

Here, all these statements are correct. Hence your answer will be option [D].

On the basis of composition of matter, milk is considered to be :

Milk is considered to be an impure substance as it is an emulsion. Emulsion is a colloid in which minute droplets of one liquid are dispersed in another liquid, which is not miscible with it.

Which of the following statements are true for pure substances?

A pure substance is made up of only one kind of particles like elements. The composition of pure compounds is also same throughout.

Recently, in a science class test, you are asked a question where you have to say whether the statements are correct or not?

The substance which is dissolved in a liquid to make a solution is called solute and the liquid in which solute is dissolved is known as solvent. For example, salt solution is made by dissolving salt in water, so in salt solution “salt” is the solute and water is the “solvent”.

Which of the following statement is or are incorrect?

Here, are all the statements are correct. Hence, your answer will be option [D].

Which of the following statement is or are incorrect?

The separation of a dissolved solids from a liquid can be done by a number of other methods such as evaporation, crystallization, distillation and chromatography etc.

Class 9 Science Chapter 2 MCQ Is Matter Around us pure?

Updated on June 10, 2023
by Tiwari Academy

Class 9 Science Chapter 2 MCQ (Multiple Choice Questions) of Is Matter Around us pure? All the questions are important for class unit tests and school’s terminal exams 2025-26. MCQ Online tests take less time to revise any chapter. So, Student can revise the entire chapter 2 of class 9 science in less time. These MCQ questions contain all intext and exercises questions also in the form of objective questions.

Class: 9	Science
Chapter: 2	Is Matter Around us pure?
Contents:	MCQ Online Test with Answers

Class 9 Science Chapter 2 MCQ with Answers

Class 9 Science Chapter 2 MCQ Online tests with solution and explanation. There are about 70 questions in the form of objectives with four choices. These MCQ covers the entire chapter of grade 9 Science NCERT Chapter 2. For the preparation of unit tests or terminal exams, students may use these questions as revision.

Two chemical species X and Y combine together to form a product P which contains both X and Y, X + Y → P, X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct?

[A]. P is a compound, X and Y are compounds, X and Y are elements.

[B]. P is a compound, X and Y are compounds, P has a fixed composition.

[C]. X and Y are compounds, X and Y are elements, P has a fixed composition.

[D]. P is a compound, X and Y are elements, P has a fixed composition.

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Read the following sentences carefully, and choose the correct one:

[A]. The property which allows the materials to be hammered or beaten into thin sheets without breaking is called malleability.

[B]. The property which allows the metals to be drawn or stretched into thin wires without breaking is called ductility.

[C]. the property due to which non-metals break into pieces on hammering is called brittleness.

[D]. All of the above

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Which of the following are physical changes?

[A]. Melting of iron metal, Rusting of iron, Bending of an iron rod

[B]. Melting of iron metal, Rusting of iron, Drawing a wire of iron metal

[C]. Melting of iron metal, Bending of an iron rod, Drawing a wire of iron metal

[D]. Rusting of iron, Bending of an iron rod, Drawing a wire of iron metal

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Tincture of iodine has antiseptic properties. This solution is made by dissolving :

[A]. Iodine in potassium iodide

[B]. Iodine in acetone

[C]. Iodine in water

[D]. Iodine in alcohol

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Rusting of an article made up of iron is called:

[A]. Corrosion and it is a physical as well as chemical change.

[B]. Dissolution and it is a physical change.

[C]. Corrosion and it is a chemical change.

[D]. Dissolution and it is a chemical change.

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Pooja is writing some statements but she confused to know why water is considered as a compound and not a mixture. If you know the answer to this question, help her to choose the incorrect statements:

[A]. Water cannot be separated into its constituent’s hydrogen and oxygen by the physical methods.

[B]. It contains hydrogen and oxygen combined together in a fixed proportion of 1 : 9 by mass.

[C]. Heat and light are given out when water is prepared by burning hydrogen in oxygen.

[D]. None of the above.

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Rahul appeared in class test but he confused to know the incorrect statement. Would you help him to know that?

[A]. Those changes in which no new substances are formed, are called physical changes. [B] The physical changes are temporary changes which can be reversed easily to form the original substance. [C] Those changes in which new substance are formed are called chemical changes. [D] The chemical changes are permanent changes which are usually reversible.

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Consider the following statements and choose the incorrect one:

[A]. The process of evaporation is used on a large scale to obtain common salt from seawater.

[B]. The substance like potash alum and potassium nitrate are also separated from their water solution by the process of evaporation.

[C]. we can separate the “colored component of ink” by the process of evaporation.

[D]. The use of process of condensation for separating a mixture is based on the fact that liquids vaporize easily whereas solid do not vaporize easily.

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Consider the following statements and choose the correct one:

[A]. The separation of two immiscible liquids by separating funnel depends on the difference in their densities.

[B]. A mixture of petrol and water can also be separated by using a separating funnel.

[C]. A mixture of mercury, water and benzene can be separated by separating funnel.

[D]. All the above.

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Q10

Which of the following are physical changes?

[A]. Melting of iron metal, rusting of iron metal, bending of an iron rod.

[B]. Melting of iron metal, rusting of iron metal, drawing a wire of iron metal.

[C]. Melting of iron metal, bending of an iron rod, drawing a wire of iron metal.

[D]. Rusting of iron metal, bending of an iron rod, drawing a wire of iron metal.

View Answer

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Last Edited: June 10, 2023