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.

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.

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.

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”.

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.

Class 9 Science Chapter 2 MCQ Is Matter Around us pure? for 2023-2024

Updated by Rakesh
on January 27, 2022, 9:59 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. 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 2023-2024

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

View Answer

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

View Answer

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

View Answer

Which of the following are homogeneous in nature?

[A]. Ice, soil

[B]. Wood, air

[C]. Ice, air

[D]. Soil, air

View Answer

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.

View Answer

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.

View Answer

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.

View Answer

Which of the following statement is or are incorrect?

[A]. Centrifugation is a method for separating the suspended particles of a substance from a liquid in which the mixture is rotated at a high speed in a centrifuge.

[B]. The process of centrifugation is used in dairies to separate cream from milk.

[C]. The separation of a dissolved solids from a liquid can be done by only one methods as evaporation.

[D]. None of the above.

View Answer

Nitika is writing some statements but she confused to know whether the statements are correct or not? If you know the answer to this question, then tell her:

[A]. A mixture of common salt and water can be separated completely by the process of distillation.

[B]. Those liquids which mix together in all proportion and form a single layer are called miscible liquids.

[C]. Pure water or distilled water is made from tap water by the process of distillation.

[D]. All the above

View Answer

Q10

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.

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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Last Edited: January 27, 2022