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.

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.

Consider the following statements and choose the correct one:

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

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.

Consider the following statements and choose the correct one:

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

Consider the following statements and choose the correct one(s):

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

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 2024-25. 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.

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:

[A]. An element cannot be split up into two or more simpler substances because it is made of only one kind of atoms.

[B]. There are 118 elements known at present, out of which 94 elements, occur in nature while the remaining 24 elements have been prepared artificially.

[C]. 11 elements are gases whereas only two elements mercury and bromine a liquid at room temperature.

[D]. All of the above

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A mixture of sulphur and carbon disulphide is:

[A]. Heterogeneous and shows Tyndall effect

[B]. Homogeneous and shows Tyndall effect

[C]. Heterogeneous and does not show Tyndall effect

[D]. Homogeneous and does not show Tyndall effect

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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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In a quiz competition, you are asked a question where you have to choose the statement which is/ are incorrect?

[A]. The electric wires are made of copper and Aluminium metals because they are very good conductors of electricity.

[B]. Only one metal, mercury, is in liquid state at room temperature.

[C]. Metal gallium has a such a low melting point that it starts melting in hand by the heat of our body.

[D]. Sodium and potassium metals have high densities than iron.

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

[A]. The solution made by dissolving solute in organic liquids are called non aqueous solutions.

[B]. The substance which is dissolved in a liquid to make a solution is called solvent.

[C]. The solute particles are also called “dispersed particles” and solvents are also known as “dispersion medium”.

[D]. None of the above.

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

[A]. Distillation is a process of heating a liquid to form vapour, and then cooling the vapour to get back liquid.

[B]. Chromatography is a technique of separating two or more dissolved solids which are present in a solution in very small quantities.

[C]. Black ink is a mixture of several colored substance or dyes which can be separated by paper chromatography.

[D]. All the above

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In a science quiz competition, Dhani are asked a question where she had to choose the statement which was/were incorrect?

[A]. Fractional distillation is the process of separating two or more miscible liquids by distillation.

[B]. A mixture of immiscible liquids is separated by using an apparatus called separating funnel.

[C]. A mixture of alcohol and water can be separated by fractional distillation.

[D]. Crystallization is not better technique than evaporation of dryness.

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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.

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Last Edited: June 10, 2023