Class 10 NCERT Solutions Our Environment

Class 10 NCERT Solutions Our Environment with answers available in Pdf for free download. The NCERT Solutions for Class 10 Science with answers have been prepared as per the latest syllabus, NCERT books and examination pattern suggested in Standard 10 by CBSE, NCERT and KVS. Solutions to questions given in NCERT book for Class 10 Science are an important part of exams for Grade 10 Science and if practiced properly can help you to get higher marks. Refer to more Chapter-wise Solutions for NCERT Class 10 Science and also download more latest study material for all subjects

Our Environment Class 10 NCERT Solutions

Class 10 Science students should refer to the following NCERT questions with answers for Our Environment in standard 10. These NCERT Solutions with answers for Grade 10 Science will come in exams and help you to score good marks

Our Environment NCERT Solutions Class 10

Class 10 NCERT Solutions Our Environment - NCERT Solutions prepared for CBSE students by the best teachers in Delhi.

Question 1: What would be the electron dot structure of carbon dioxide which has the formula CO2?

Answer: Electron dot structure of CO2 is

Question 2: What would be the electron dot structure of a molecule of sulphur which is made up of eight atoms of sulphur? (Hint − the eight atoms of sulphur are joined together in the form of a ring.)

Answer: Electron dot structure of a sulphur molecule

Question 3: How many structural isomers can you draw for pentane?

Answer: Three structural isomers are possible for pentane.

Question 4: What are the two properties of carbon which lead to the huge number of carbon compounds we see around us?

Answer: The two features of carbon that give rise to a large number of compounds are as follows:

(i) Catenation - It is the ability to form bonds with other atoms of carbon.

(ii) Tetravalency - With the valency of four, carbon is capable of bonding with four other atoms.

Question 5: What will be the formula and electron dot structure of cyclopentane?

Answer: The formula for cyclopentane is C5H10. Its electron dot structure is given below.

Question 6: Draw the structures for the following compounds.

(i) Ethanoic acid (ii) Bromopentane*

(iii) Butanone (iv) Hexanal

*Are structural isomers possible for bromopentane?

Question 7: Why do ionic compounds have high melting points?

Answer: Ionic compounds have strong electrostatic forces of attraction between the ions. Therefore, it requires a lot of energy to overcome these forces. That is why ionic compounds have high melting points.

Question 8: Why is the conversion of ethanol to ethanoic acid an oxidation reaction?

Answer: Since the conversion of ethanol to ethanoic acid involves the addition of oxygen to ethanol, it is an oxidation reaction.

Question 9: A mixture of oxygen and ethyne is burnt for welding. Can you tell why a mixture of ethyne and air is not used?

Answer: When ethyne is burnt in air, it gives a sooty flame. This is due to incomplete combustion caused by limited supply of air. However, if ethyne is burnt with oxygen, it gives a clean flame with temperature 3000°C because of complete combustion. This oxy-acetylene flame is used for welding. It is not possible to attain such a high temperature without mixing oxygen. This is the reason why a mixture of ethyne and air is not used.

Question 10: How would you distinguish experimentally between an alcohol and a carboxylic acid?

Answer: We can distinguish between an alcohol and a carboxylic acid on the basis of their reaction with carbonates and hydrogen carbonates. Acid reacts with carbonate and hydrogen carbonate to evolve CO2 gas that turns lime water milky. Alcohols, on the other hand, do not react with carbonates and hydrogen carbonates.

Question 11: What are oxidising agents?

Answer:Some substances such as alkaline potassium permanganate and acidified potassium dichromate are capable of adding oxygen to others. These are known as oxidising agents.


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Chapter 1 Chemical Reactions and Equations
Class 10 NCERT Solutions Chemical Reactions and Equations
Chapter 2 Acids, Bases and Salt
Class 10 NCERT Solutions Acids Bases and Salts
Chapter 3 Metals and Nonmetals
Class 10 NCERT Solutions Metals and Non-metals
Chapter 4 Carbon and Its Compounds
Class 10 NCERT Solutions Carbon and its Compounds
Chapter 5 Periodic Classification of Elements
Class 10 NCERT Solutions Periodic Classification of Elements
Chapter 6 Life Processes
Class 10 NCERT Solutions Life Processes
Chapter 7 Control and Coordination
Class 10 NCERT Solutions Control and Coordination
Chapter 8 How do Organisms Reproduce?
Class 10 NCERT Solutions How do Organisms Reproduce
Chapter 9 Heredity and Evolution
Class 10 NCERT Solutions Heredity and Evolution
Chapter 10 Light Reflection and Refraction
Class 10 NCERT Solutions Light-Reflection and Refraction
Chapter 11 The Human Eye and Colourful World
Class 10 NCERT Solutions Human Eye and Colourful World
Chapter 12 Electricity
Class 10 NCERT Solutions Electricity
Chapter 13 Magnetic Effects of Electric Current
Class 10 NCERT Solutions Magnetic Effects of Electric current
Chapter 14 Sources of Energy
Class 10 NCERT Solutions Sources of Energy
Chapter 15 Our Environment
Class 10 NCERT Solutions Our Environment
Chapter 16 Sustainable Management of Natural Resources
Class 10 NCERT Solutions Management of Natural Resources

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