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].

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].

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

Iodine dissolved in alcohol is called tincture of iodine.

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.

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].

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? for 2022-2023

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. 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 for 2022-2023

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 rusting of an iron object is called:

[A]. Corrosion and it is a physical as well as a 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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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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On the basis of composition of matter, milk is considered to be :

[A]. A pure substance

[B]. An impure substance

[C]. An element

[D]. A compound

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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.

View Answer

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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Which of the following statement is or are incorrect?

[A]. A solution in which more quantity of solute can be dissolved without raising its temperature, is called an unsaturated solution.

[B]. A solution in which no more solute can be dissolved at that temperature is called a saturated solution.

[C]. If a saturated solution at a particular temperature is heated to a higher temperature, then it becomes unsaturated.

[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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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

Start a New Test

What is a Solution?

A solution is a homogeneous mixture of two or more substances.

What are the main constituents of air?

The two main constituents of air are oxygen (21%) and nitrogen (78%).

What is Suspension?

A non-homogeneous systems in which solids are dispersed in liquids, are called suspensions. A suspension is a heterogeneous mixture in which the solute particles do not dissolve but remain suspended throughout the bulk of the medium.

Write down two properties of Colloids?

1. Colloids are big enough to scatter a beam of light passing through it and make its path visible.
2. They do not settle down when left undisturbed, that is, a colloid is quite stable.

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