CBSE NCERT Solutions for Class 9 Science Chapter 2

CBSE NCERT Solutions for Class 9 Science Chapter 2 Is Matter Around Us Pure Page 15 or Page 18 or Page 24 or Exercises in English Medium or पेज 16 के उत्तर or पेज 20 के उत्तर or पेज 26 के उत्तर or पेज 27 के उत्तर or अभ्यास के प्रश्न उत्तर  in Hindi Medium study online or download in PDF form free. NCERT Solutions of other subjects are also available free to download in PDF file format.


CBSE NCERT Solutions for Class 9 Science Chapter 2

CBSE NCERT Solutions for Class 9 Science Chapter 2

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Page 15 Answers

NCERT Solutions for Class 9 Science Chapter 2 Is Matter Around Us Pure Intext Questions on page 15 is given below. Visit here for Page 18 or Page 24 or Exercises in English or go for Hindi Medium Solutions. Go back to Class 9 Science main page or move to Top of page.

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Page 18 Answers

NCERT Solutions for Class 9 Science Chapter 2 Is Matter Around Us Pure Intext Questions on page 18 is given below. Visit here for  Page 15 or Page 24 or Exercises in English or go for Hindi Medium Solutions. Go back to Class 9 Science main page or move to Top of page.

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Page 24 Answers

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Exercises Questions Answers

NCERT Solutions for Class 9 Science Chapter 2 Is Matter Around Us Pure Exercises Questions at the end of chapter is given below. Visit here for  Page 15 or Page 18 or Page 24 or go for Hindi Medium Solutions. Go back to Class 9 Science main page or move to Top of page.

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पेज 16 के उत्तर




NCERT Solutions for Class 9 Science Chapter 2 Is Matter Around Us Pure Intext Questions पेज 16 के उत्तर is given below. Visit here for पेज 20 के उत्तर or पेज 26 के उत्तर or पेज 27 के उत्तर or अभ्यास के प्रश्न उत्तर  or go for English Medium Solutions. Go back to Class 9 Science main page or move to Top of page.

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पेज 20 के उत्तर





NCERT Solutions for Class 9 Science Chapter 2 Is Matter Around Us Pure Intext Questions पेज 20 के उत्तर is given below. Visit here for पेज 16 के उत्तर or पेज 26 के उत्तर or पेज 27 के उत्तर or अभ्यास के प्रश्न उत्तर  or go for English Medium Solutions. Go back to Class 9 Science main page or move to Top of page.

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पेज 26 के उत्तर




NCERT Solutions for Class 9 Science Chapter 2 Is Matter Around Us Pure Intext Questions पेज 26 के उत्तर is given below. Visit here for पेज 16 के उत्तर or पेज 20 के उत्तर or पेज 27 के उत्तर or अभ्यास के प्रश्न उत्तर  or go for English Medium Solutions. Go back to Class 9 Science main page or move to Top of page.

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पेज 27 के उत्तर




NCERT Solutions for Class 9 Science Chapter 2 Is Matter Around Us Pure Intext Questions पेज 27 के उत्तर is given below. Visit here for पेज 16 के उत्तर or पेज 20 के उत्तर or पेज 26 के उत्तर or अभ्यास के प्रश्न उत्तर  or go for English Medium Solutions. Go back to Class 9 Science main page or move to Top of page.

NCERT Solutions for Class 9 Science Chapter 2 page 27

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NCERT Solutions for Class 9 Science Chapter 2 Is Matter Around Us Pure अभ्यास के प्रश्न उत्तर is given below. Visit here for पेज 16 के उत्तर or पेज 20 के उत्तर or पेज 26 के उत्तर or पेज 27 के उत्तर or go for English Medium Solutions. Go back to Class 9 Science main page or move to Top of page.

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Important Questions Based on CBSE Previous Years Papers
Class 9 Science – Is Matter Around Us Pure

Question 1:
A diamond knife is quite often used for cutting glass. Why?
Answer 1:
Diamond is probably the hardest substance known. Therefore, a knife made from a special type of diamond is used for cutting the glass.

Question 2:
Explain how does soap help in cleaning dirty clothes?
Answer 2:
In dirty clothes, the dust particles are present on oil are present on oil drops sticking to them. Simple water cannot remove these oil drops from the clothes because water and oil as such do not form a stable emulsion. Soap plays the role of emulsifier and helps in forming a stable emulsion between the two. This means that soap helps in removing these oil drops along with the dirt sticking to them. The dirty clothes get washed by soap solution.

Question 3:
How will you justify that rusting of iron is a chemical change?
Answer 3:
The rust is a brown chemical compound known as hydrated ferric oxide. It cannot be removed from the surface of the metal b any means. Formula of a rust shows that iron has undergone a chemical change.

Question 4:
Colloidal solution show Tyndall effect but true solution do not. Discuss.
Answer 4:
In a colloidal solution, the particle size is such (1 nn to 100 nm), that these particles scatter the light rays as they fall on them. Because of scattering the path of the light as well as the particle become visible. But in a true solution, the particle size is so small (less than 1 nm) that these particles are not in a position to scatter the light. Therefore, true solution does not show any Tyndall effect.

More Questions for Practice

Question 1:
Why do not the dispersed phase particles in a colloidal solution combine with one other?
Answer 1:
They do not come closer because of the presence of either positive or negative charge on them. Due to mutual repulsion, these particles remain scattered in a colloidal solution.

Question 2:
What is the function of fractionating column in fractional distillation?
Answer 2:
A fractionating column obstructs the upwards movement of the vapours of the liquids. As a result, the energy (latent heat of fusion) which is released by the high boiling liquid is taken by the low boiling liquid. It remains in the vapours state. The high boiling liquid by releasing energy condenses and falls back in the distillation flask. Thus, fractionating column helps in the separation of the components from a mixture.

Question 3:
Alloys are sometimes called substitutional solid solutions. Explain.
Answer 3:
Alloys are the homogeneous mixtures of two or more metals. For example, brass is a mixture of copper and zinc. Actually, copper is a crystalline solid in which the atoms are closely packed to form a crystal lattice. Some of these atoms have been replaced or substituted by atoms of zinc. Therefore, brass is regarded as a substitutional solid solution.

Question 4:
All mixtures are homogeneous. Is this statement correct? Justify your answer.
Answer 4:
No, this statement is wrong. Mixture because they have combined with each other to form ammonium chloride which is a new substance. A mixture is always formed by mixing non-reacting substances.
Ammonia (gas) + Hydrogen chloride (gas) → Ammonium chloride (solid).