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].

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

Metals are good conductors of heat and electricity. This refers that metals allow heat and electricity to pass through them easily. Metals are generally good conductor of heat. Silver metal is the best conductor of heat. Gold and silver have the highest thermal conductivity. Copper and Aluminium metals are also very good conductors of heat.

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.

Consider the following statements and choose the correct one:

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

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:

The composition of water is fixed. It contains hydrogen and oxygen combined together in a fixed proportion of 1 : 8 by mass. It has a definite formula H2O.

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 by Tiwari Academy
on June 10, 2023, 8:29 AM

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 2023-24. 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.

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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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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Which of the following statement is or are correct?

[A]. Metals can be beaten into thin sheets with the hammer without breaking.

[B]. Metals can be drawn or stretched into thin wires.

[C]. Metals allow heat and electricity to pass through them easily.

[D]. All of the above

View Answer

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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Which of the following statements are true for pure substances?

[A]. Pure substances contain only one kind of particles, pure substances may be compounds or mixtures.

[B]. Pure substances contain only one kind of particles; pure substances have the same composition throughout.

[C]. Pure substances have the same composition throughout, pure substances can be exemplified by all elements other than nickel.

[D]. Pure substances may be compounds or mixtures, pure substances have the same composition throughout.

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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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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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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.

View Answer

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Last Edited: June 10, 2023