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Is Matter Around Us Pure - MCQ Test (22-11-2017) - Class 9 MCQ


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30 Questions MCQ Test - Is Matter Around Us Pure - MCQ Test (22-11-2017)

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Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 1

Name the most abundant element in earth’s crust?

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 1

The most abundant element in earth’s crust is Oxygen. It is present in earth crust in form of oxide, carbonate etc. of metal.

Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 2

What is the density of ice at its melting point?

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 2

The density of ice at its melting point is less than density of water. Ice have less density than water, that is why ice float on water.

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Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 3

Name the emulsifier which stabilizes milk emulsion.

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 3

The emulsifier which stabilizes milk emulsion is called Casein. Casein is found in mammalian milk, making up 80% of the protein in cow milk and between 20% and 45% of the protein in human milk.

Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 4

22 carrot gold is

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 4

22 carrot gold is homogenous mixture of 22 parts gold and 2 parts copper or silver. 22 carrot gold is pure gold and an element.

Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 5

A Substance can be beaten into sheets and beaten into wires. What will you call it?

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 5

A substance that can be beaten into thin sheets and drawn into thin wire is both malleable and ductile. Gold is most malleable and ductile element.

Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 6

Which of following is correct about solubility- 
(A) It increases with increase in temperature 
(B) Mass of solute dissolution in 100 units of solvent 
(C) Solubility of common salt in water in 46g at 20c
(D) It decreases with decrease in temperature 

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 6
Correct Statements about Solubility:
There are four statements given about solubility. Let's analyze each statement to determine which ones are correct.
(A) It increases with an increase in temperature:
- This statement is correct. In general, solubility tends to increase with an increase in temperature. This is because higher temperatures provide more energy for the solute particles to break apart and mix with the solvent particles.
(B) Mass of solute dissolution in 100 units of solvent:
- This statement is correct. Solubility is often expressed as the mass of solute that can dissolve in a given amount of solvent. For example, if the solubility of a substance is 50g/100g of water, it means that 50 grams of the substance can dissolve in 100 grams of water.
(C) Solubility of common salt in water is 46g at 20°C:
- This statement is incorrect. The solubility of common salt (sodium chloride) in water at 20°C is approximately 36g/100g of water, not 46g. The solubility of a substance can vary with different temperatures and conditions.
(D) It decreases with a decrease in temperature:
- This statement is correct. In most cases, solubility decreases with a decrease in temperature. This is because lower temperatures reduce the energy available for solute particles to dissolve in the solvent. However, there are some exceptions to this general trend, such as the solubility of gas solutes, which often increase with a decrease in temperature.
Conclusion:
Based on the analysis, the correct statements about solubility are:
- Statement (A): It increases with an increase in temperature.
- Statement (B): Mass of solute dissolution in 100 units of solvent.
- Statement (D): It decreases with a decrease in temperature.
Therefore, the correct answer is option A: (a), (b), and (d) are correct.
Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 7

The particle size of a substance ‘P’ present in water is 200 nm. What will be the nature of the solution expected?

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 7

The particle size of suspension is greater than 100 nm. So, particle size of substance ‘P’ present in water will be the suspension.

Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 8

Two miscible liquids A and B are present in solution. The boiling point of A is 60°C and that of B is 90°C. Which of the following method is used to separate these two liquids?

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 8

To separate two miscible liquids from a mixture having boiling point temperature difference of more than 2 degree, fractional distillation is used.

Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 9

What are the major constituents of universe?

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 9

The major constituents of universe are Hydrogen and Helium. They are constituent of Sun, stars and other solar bodies.

Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 10

Clouds and fogs are example of

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 10

Clouds and fogs are example of liquid in gas solution. Cloud is formed by combination of water vapour with dust particles. Fogs contain water vapour and gases.

Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 11

An emulsion is a colloidal solution formed by mixing

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 11

An emulsion s a colloidal solution formed by mixing of two immiscible liquids.

Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 12

Which method is applied to separate the colored material from flower petals?

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 12

The coloured material from flower petals can be separated by chromatography process. Chromatography is used to separate materials present in solution in vary trace amount.

Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 13

Which of the following element has the characteristics of both metals and non – metals?

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 13

The element that possesses characteristic of both metal and non-metal are called metalloid. Arsenic is the element that has properties of both metal and non-metal.

Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 14

Brass is a homogeneous mixture of

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 14

Brass is a homogenous mixture of 70% of Copper and 30% Zinc by mass. Copper and Zinc forms homogenous mixture as constituent particles are not visible

Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 15

When a beam of light is passed through a colloidal solution, it gets.

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 15

Scattering of beam of light when passes through a solution is called tyndall effect. Colloidal solution shows the tyndall effect and scatter the beam of light.

Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 16

NH4Cl is separated from NaCl by which one of the following method.

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 16

NH4Cl is separated from NaCl by heating the solid mixture in a test tube. NH4Cl being sublime change into vapour which can be collected by cooling it. Nacl remain in test tube.

Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 17

Which of the following has the smell of rotten egg?

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 17

Hydrogen sulphide gas has the smell of rotten egg.

Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 18

Which of the following will be a heterogeneous mixture?

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 18

The mixture in which particles are not distributed evenly and forms separate layer if left undisturbed. The mixture of Albumin and water forms a heterogeneous mixture.

Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 19

What is the name given to the liquid which contains in it some suspended particles?

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 19

The liquid which contains some suspended particles are called suspension. The size of particle is more than 100nm.

Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 20

What is the correct order of the methods you apply to separate the components of a mixture of NH4Cl, common salt and sand?

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 20

=To separate the components of a mixture of NH4Cl, common salt and sand, mixture is dissolved in water followed by filtration to separate sand. Evaporation of NH4Cl and common salt mixture is done to dry it. Sublimation of mixture separate NH4Clfrom common salt being sublime.

Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 21

Which of the following substance is pure?

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 21

Element and compounds are pure substance. Pure substances are made up of only one kind of particles. Elements are made up of atoms and compounds are made up to molecules.

Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 22

4 g of solute are dissolved in 36 g of water. What is the mass percent of the solution?

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 22

Mass percent of solution = (mass of solute / mass of solution)×100%(mass of solute / mass of solution)×100%
= (4/4+36)×100%
(4/4+36)×100% = 10%.

Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 23

Size of particles in a collided solution ranges from

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 23

The size of particles in colloidal solution ranges from 10−5cm to 10−3cm. less than 10−5 is true solution and more than 10−7 is suspension.

Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 24

What will be the boiling point of water at the top of a mountain where the atmospheric pressure is less than 1 atm?

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 24

Boiling point of water decreases with increase in altitude. At the top of mountain where the atmospheric pressure is less than 1 atm water boils below 100°C.

Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 25

Who discovered Radium?

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 25

Radium was discovered by Marie Curie.

Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 26

 Brass is a solution of molten copper in       

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 26
Explanation:
To determine the solution of molten copper in brass, we need to identify the correct component or alloy that is mixed with copper in its molten state.
Brass is an alloy that is primarily composed of copper and zinc. It is created by melting copper and adding zinc to it. The molten zinc is then mixed with the molten copper to form brass.
Therefore, the correct answer is option B: molten zinc.
Summary:
Brass is a solution of molten copper in molten zinc.
Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 27

An example of colloid is

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 27

Air is a mixture, salt solution is a true solution and milk is a colloids having disperse phase of protein and fat in dispersing medium of water and other substance.

Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 28

Statement A : Brass is a solution while gun powder is not 

Statement B : Air represents a solution in terms of science 

Which of the two statements is true

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 28

Brass is a homogeneous mixture of copper and Zinc. Gun powder is not a powder is a simple mixture of saltpeter, sulfur and charcoal. Air is a mixture of gases.

Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 29

A combination of common salt and iron filings is a

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 29

A combination of common salt and Iron filings is a mixture as there is no chemical reaction between them to form new substance.

Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 30

Identify homogeneous mixture from the following

Detailed Solution for Is Matter Around Us Pure - MCQ Test (22-11-2017) - Question 30

A dilute solution of alcohol in water is an example of homogenous mixture. Alcohol and water do not forms a separate boundary if left undisturbed and both are uniformly distributed.

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