Science: Is Matter Around Us Pure - Mixture


Which separation techniques will you apply for the separation of the Wheat grains from husk.



Wheat grains from husk → Winnowing

Concept: Mixture
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Chapter 2: Is Matter around us Pure - Exercises [Page 28]


NCERT Science Class 9
Chapter 2 Is Matter around us Pure
Exercises | Q 1.09 | Page 28

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What are the characteristic properties of a pure substance? Why do we need them?

Define :- Immiscible liquids

Select the correct alternative from the choices given for the following statement:

Example of a homogeneous mixture is 

Fill in the blank

Mixtures can be ________ or _______ 

When a mixture of iron powder and sulphur powder is heated strongly to form iron sulphide, then heat energy is :

Which one of the following is most likely to exhibit Tyndall effect ?

Name any two solid substances whose mixture can be separated by sublimation.

How would you separate a mixture of sugar and salt?

How will you separate a mixture of kerosene oil and water ? Explain with the help of a labelled diagram.

Matter is classified into the types of mixture, compound and element by applying the criterion ______.

Milk is an example of a type of matter called __________.

Seawater tastes salty due to the dissolved salt. the salinity (the proportion of salts in water) of some water bodies Lonar lake - 7.9 %, Pacific Ocean 3.5%, Mediterranean sea- 3.8%, Dead sea- 33.7%. Explain two characteristics of the mixture from the above information.

Give two examples.

Homogeneous mixture

The constituents of a mixture are present in a fixed ration.

Solutions are

Define the following:

Impure substance

Give two examples of the following type of mixture.


Name the components present in the following mixture:


Define Immiscible liquids

Name two substances which can sublime.

Name four substances that can be used as filters.

Fill in the blanks

The substances that make a mixture are called its ______or_________.

Fill in the blank

Ammonium chloride can be separated from common salt by the method of sublimation.

Match the statements in List I with the correct answer in List II.

List I List II
1. Purification of water by adding alum A: Sublimation
2. Seawater leaving behind common salt B: Sieving
3. Separation of camphor and potassium chloride C: Filtration
4. Separation of charcoal from a charcoal-water mixture D: Sedimentation 
5. Separation of bran and wheat flour E: Evaporation

State whether the following statement is true or false. If false write – the correct statement.

Heterogeneous mixtures have different composition and properties throughout the mixture.

Write answer to the following question in your own words.

How are the components of mixtures separated by simple methods?

Four atoms of hydrogen combine with one atom of carbon to give methane [CH4]. State the valency of carbon.

Differentiate between a homogenous and a heterogeneous mixture with one example of each in the (a) solid-solid (b) solid-liquid If (c) liquid-liquid state of the mixture.

Select the correct answer from the choice in the bracket.

A homogenous mixture.

Give a reason for the following statement:

Gunpowder is an example of a heterogenous mixture.

Complete the given analogy.

Iron – sulphur mixture : ______:: Mustard seeds from Urad-dhal: Rolling

Give an example for mixture and justify your answer with reason.

Write the sequence of steps you would use for making tea. (Use the words: mixture, dissolve, filtrate and residue).

Make a fruit or vegetable salad. Give reasons why you think it is a mixture.

A few drops of ‘Dettol’ when added to water the mixture turns turbid. Why?

How will you separate a mixture containing saw dust, naphthalene and iron filings?

Why do we need to separate different components of a mixture? Give two examples.

Air is a mixture. Justify.

Give the characters a mixture.

Milk is a ______.

Suggest separation technique(s) one would need to employ to separate the following mixture.

Potassium chloride and ammonium chloride

What would you observe when

an aqueous sugar solution is heated to dryness.

What would you observe when

a mixture of iron filings and sulphur powder is heated strongly

You are given two samples of water labelled as ‘A’ and ‘B’. Sample ‘A’ boils at 100°C and sample ‘B’ boils at 102°C. Which sample of the water will not freeze at 0°C? Comment.

Can we separate alcohol dissolved in water by using a separating funnel? If yes, then describe the procedure. If not, explain.

Supernatant denotes the heterogeneous mixture, lying above a solid residue, after crystallization, precipitation, centrifugation, or another process.

The constituents that form a mixture are also called ______.

When elements are physically mixed they form ______.

A mixture of iron filings and salt is a ______ type of mixture.

Expand LPG ______.

LPG is ______ gas. 

A mixture does not have a fixed ______.

List out the characteristics of Mixtures.

Write scientific reason.

Lemon sherbet has a sweet, sour and salty taste, and it can be poured into a glass.

Write scientific reason.

Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.

Write scientific reason.

Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.


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