CBSE Class 10 Science Chapter-4 Carbon and Its Compounds Important Questions – Free PDF Download
Free PDF download of Important Questions with Answers for CBSE Class 10 Science Chapter 4 – Carbon and Its Compounds prepared by expert Science teachers from latest edition of CBSE(NCERT) books only by CoolGyan to score more marks in CBSE board examination.
CBSE Class 10 Science Carbon and Its Compounds Chapter-4 Important Questions
CBSE Class 10 science Important Questions Chapter 4 – Carbon and Its Compounds
5 Mark Questions
1. Define fermentation. Name the enzyme which converts
(a) milk into curd (yogurt)
(b) Cane sugar into glucose and fructose
(c) glucose into ethanol
Ans. The preparation of ethyl alcohol from sugar 
is known as fermentation.
(a) Lactase converts milk into curd
(b) Invertase converts cane sugar into glucose and fructose
(c) Zymase converts glucose into ethanol.
2. (a) Name the gas evolved during fermentation process?
(b) What role is played by yeast in the conversion of cane sugar to ethanol?
(c) How may the following be obtained from pure ethanol? Express
s chemical reactions by the chemical equations.
(i) Sodium ethoxide
(ii) Ethyl ethanoate
(iii) Ethanal
Ans. (a) 
gas is evolved accompanied by brisk effervescence.
(b) Yeast is the source of enzymes invertase and zymase needed for fermentation.
(c) (i) 
(ii) 
(Ethyl ethanoate)
(iii) 
3. An organic compound A is widely used as a preservative in pickles and has a molecular formula
. This compound reacts with ethanol to form a sweet smelling compound B.
(a) Identify the compound A.
(b) Write the chemical equation for its reaction with ethanol to form compound B.
(c) How can we get compound A back from B.
(d) Name the process and write the corresponding chemical equation.
(e) Which gas is produced when compound A reacts with washing soda? Write the chemical equation?
Ans. (a) Compound A is ethanoic acid 
(b) 
Ethanoic acid Ethyl Ethanoate (Ester)
(c) 
Ethanoic acid
(d) The process is known as ester hydrolysis.
(e) is produced with effervescence when compound A reacts with washing soda which is chemically 
4. (a) Why does carbon form largest number of compounds?
(b) Why are some of these called saturated and other unsaturated compounds?
(c) Which of these two is more reactive?
(d) Write the names of the following compounds
(i) 
(ii) 
Ans. (a) Carbon forms large number of compounds called organic compounds due to the self linking property called catenation.
(b) Compounds which has only C-C (single bond) present are saturated compounds whose as those compounds which has C=C (double bond) or C
C (triple) bond is present are called unsaturated compounds.
(c) Unsaturated compounds are more reactive than saturated compounds
(d) (i) Bromoethane
(ii) Hex-1-yne
5. Draw the structure for the following compounds:
(i) Ethanoic acid
(ii) Bromopentane
(iii) Butane
(iv) Hexanal
Ans. Structure of compounds are given as under:
(i) Ethanoic acid
(ii) Bromopentane
(iii) Butanone
(iv) Hexanal
6. Draw the electron dot structure for
(a) Ethanoic acid
(b) 
(c) Propanone
(d) 
Ans. (a) Ethanoic acid
(b) 
(c) Propanone
(d) 
7. Why does micelle formation take place when soap is added to water? Will a micelle be formed in other solvents such as ethanol also?
Ans. Soap is sodium or potassium salt of long chain fatty acid. Two ends of soap molecules have different properties. The ionic end is hydrophilic. It dissolve in water while the hydrogen chain is hydrophobic, it dissolve in hydrocarbon. The hydrocarbon chains are oriented towards the oil droplet while the ionic ends are oriented towards water.
Micelles formation will not take place in ethanol.
8. An organic compound ‘A’ is widely used as a preservative in pickles and has a molecular formula C This compound reacts with ethanol to form a sweet smelling compound ‘B.
(i) Identify the compound ‘A’
(ii) Write the chemical equation for its reaction with ethanol to form compound ‘B’.
(iii) How can we get compound ‘A’ back from ‘B’?
(iv) Name the process and write corresponding chemical equation.
(v) Which gas is produced when compound ‘A’ reacts with washing soda?
Write the chemical equation.
Ans. (i) Ethanoic acid, 
(ii) 
(iii) Esters react in the presence of an acid or a base to give back the alcohol and carboxylic acid.
(iv) Saponification
(v) gas evolved
