Class 10 Exam > Class 10 Notes > Science Class 10 > Unit Test: Carbon and its Compounds
Unit Test: Carbon and its Compounds | Science Class 10 PDF Download
Time: 1 Hour
M.M. 30 Marks
Attempt all Questions
- Question numbers 1 to 5 carry 1 mark each.
- Question numbers 6 to 8 carry 2 marks each.
- Question numbers 9 to 11 carry 3 marks each.
- Question number 12 & 13 carry 5 marks each.
Q1. How many double bonds are there in a saturated hydrocarbon? (1 Mark)
(a) One
(b) Two
(c) Three
(d) Zero
Q2. The allotrope of carbon which is a good conductor of heat and electricity is (1 Mark)
(a) Diamond
(b) Graphite
(c) Charcoal
(d) None of these
Q3. Which of the following will undergo an addition reaction? (1 Mark)
(a) CH4
(b) C3H8
(c) C2H6
(d) C2H4
Q4. In a diamond, each carbon atom is bonded to four other carbon atoms to form (1 Mark)
(a) A hexagonal array
(b) A rigid three-dimensional structure
(c) A structure in the shape of a football
(d) A structure of a ring
Q5. C3H8 belongs to the homologous series of (1 Mark)
(a) Alkynes
(b) Alkenes
(c) Alkanes
(d) Cycloalkanes
Q6. Gas is evolved when ethanol reacts with sodium. Name the gas evolved and write the balanced chemical equation of the reaction involved. (2 Marks)
Q7. How is ethene prepared from ethanol? Give the reaction involved in it. (2 Marks)
Q8. Carbon, the Group (14) element in the Periodic Table, is known to form compounds with many elements. Write an example of a compound formed with (2 Marks)
(a) Chlorine (Group 17 of the periodic table)
(b) Oxygen (Group 16 of the periodic table)
Q9. Name the functional groups present in the following compounds (3 Marks)
(a) CH3COCH2CH2CH2CH3
(b) CH3CH2CH2COOH
(c) CH3CH2CH2CH2CHO
Q10. Unsaturated hydrocarbons contain multiple bonds between the two C-atoms and show addition reactions. Give the test to distinguish ethane from ethene. (3 Marks)
Q11. A compound X is formed by the reaction of carboxylic acid C2H4O2 and alcohol in the presence of a few drops of H2SO4. The alcohol on oxidation with alkaline KMnO4 followed by acidification gives the same carboxylic acid as used in this reaction. Give the names and structures of (a) carboxylic acid, (b) alcohol, and (c) compound X. Also, write the reaction. (3 Marks)
Q12. Write the structural formulae of all the isomers of hexane. (5 Marks)
Q13. Look at Figure and answer the following questions: (5 Marks) 
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FAQs on Unit Test: Carbon and its Compounds - Science Class 10
| 1. What are the main characteristics of carbon that make it essential for life? |  |
Ans.Carbon is essential for life due to its ability to form stable bonds with various elements, including itself. It can form four covalent bonds, allowing for a diverse range of complex organic molecules, such as carbohydrates, proteins, lipids, and nucleic acids. This versatility is crucial for the formation of the biomolecules necessary for life processes.
| 2. What are the different allotropes of carbon, and how do they differ from each other? | |
Ans.The main allotropes of carbon are diamond, graphite, and fullerenes. Diamond has a tetrahedral structure, making it extremely hard and an excellent insulator. Graphite has a layered structure, allowing it to conduct electricity and be used as a lubricant. Fullerenes, like C60, have a spherical structure and exhibit unique properties useful in materials science.
| 3. How is carbon dioxide used in photosynthesis? | |
Ans.Carbon dioxide is a crucial component in photosynthesis, the process by which green plants convert light energy into chemical energy. During photosynthesis, plants absorb carbon dioxide from the atmosphere and use sunlight to convert it into glucose and oxygen. This process is vital for producing food and oxygen, supporting life on Earth.
| 4. What are the common uses of carbon compounds in everyday life? | |
Ans.Carbon compounds are widely used in everyday life. For example, hydrocarbons such as gasoline and diesel are used as fuels. Carbon compounds like glucose serve as energy sources for living organisms. Additionally, plastics, which are carbon-based polymers, are used in packaging, containers, and countless other products.
| 5. What is the significance of carbon's ability to form covalent bonds in organic chemistry? | |
Ans.Carbon's ability to form covalent bonds is fundamental to organic chemistry, as it allows for the creation of a vast array of organic compounds. This bonding capability leads to the formation of chains and rings, enabling the development of complex structures like proteins, enzymes, and DNA. These compounds are crucial for biological functions and processes.
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