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.

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

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

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].

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.

The property/properties which enable copper metal to be used for making electric wires is / are

[A]. Copper metal is malleable and ductile

[B]. Copper metal is a good conductor of electricity

[C]. Copper metal is ductile and has low electrical resistance

[D]. Copper metal is sonorous and an excellent conductor of electricity

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Which of the following are chemical changes?

[A]. Decaying of wood, Burning of wood

[B]. Burning of wood, Sawing of wood

[C]. Sawing of wood, Hammering of a nail into a piece of wood

[D]. Decaying of wood, Hammering of a nail into a piece of wood

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

[A]. Aluminium foil are used for packing food items like biscuits, chocolates, medicine, cigarettes, etc.

[B]. Ductility is another important characteristic property of metals.

[C]. Malleability is an important characteristic property of metals.

[D]. The poorest conductor of heat among the metals is gold and silver.

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

[A]. In a colloidal solution or colloid the particles are big enough to scatter light.

[B]. The scattering of light by colloidal particles is known as “Tyndall effect”.

[C]. Colloids are heterogeneous in nature, though they appear to be homogeneous.

[D]. The particles of most of the colloids can be seen with a microscope.

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Priya is writing some statements, choose the incorrect statement and help him:

[A]. A soap solution cannot scatter a beam of light passing through it.

[B]. An emulsion is a colloid in which minute droplets of one liquid are dispersed in another liquid which is not miscible with it.

[C]. The gel is a semi-solid colloid in which there is a continuous network of solid particles dispersed in a liquid.

[D]. An aerosol is a colloid in which a solid or liquid is dispersed in a gas as fog, mist etc.

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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 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

In the last year board examination, Rahul were asked a question where he had to choose the statement which was/were incorrect? Will you be able to answer this question?

[A]. A compound is a substance made up of two or more elements chemically combined in a fixed proportion by mass.

[B]. In the form of heat, light etc. usually energy is either given out or absorbed during the preparation of a compound.

[C]. If the substance has a fixed melting point, boiling point etc. that means it is a mixture.

[D]. A mixture can be separated into its constituents by the physical process like filtration, evaporation, distillation etc.

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Last Edited: June 10, 2023