Carbon and its Compounds

Samacheer Book Back Questions And Answers For Science Standard 10 “Carbon and its Compounds“

I. Choose the best answer:
1. The molecular formula of an open chain organic compound is C₃H₆. The class of the compound is
a. alkane
b. alkene
c. alkyne
d. alcohol

2. The IUPAC name of an organic compound is 3-Methyl butan-1-ol. What type compound it is?
a. Aldehyde
b. Carboxylic acid
c. Ketone
d. Alcohol

3. The secondary suffix used in IUPAC nomenclature of an aldehyde is ____
a. – ol
b. – oic acid
c. – al
d. – one

4. Which of the following pairs can be the successive members of a homologous series?
a. C₃H₈ and C₄H₁₀
b. C₂H₂ and C₂H₄
c. CH₄ and C₃H₆
d. C₂H₅OH and C₄H₈OH

5. C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O is a
a. Reduction of ethanol
b. Combustion of ethanol
c. Oxidation of ethanoic acid
d. Oxidation of ethanol

6. Rectified spirit is an aqueous solution which contains about _____ of ethanol
a. 95.5 %
b. 75.5 %
c. 55.5 %
d. 45.5 %

7. Which of the following are used as anaesthetics?
a. Carboxylic acids
b. Ethers
c. Esters
d. Aldehydes

8. TFM in soaps represents _____ content in soap
a. mineral
b. vitamin
c. fatty acid
d. carbohydrate

9. Which of the following statements is wrong about detergents?
a. It is a sodium salt of long chain fatty acids
b. It is sodium salts of sulphonic acids
c. The ionic part in a detergent is –SO₃^–Na⁺
d. It is effective even in hard water.

II. Fill in the blanks:
1. An atom or a group of atoms which is responsible for chemical characteristics of an organic compound is called _____.
2. The general molecular formula of alkynes is _____.
3. In IUPAC name, the carbon skeleton of a compound is represented by _____ (root word / prefix / suffix)
4. (Saturated / Unsaturated) _____ compounds decolourize bromine water.
5. Dehydration of ethanol by conc. Sulphuric acid forms _____ (ethene/ ethane)
6. 100 % pure ethanol is called _____.
7. Ethanoic acid turns _____ litmus to _____.
8. The alkaline hydrolysis of fatty acids is termed as _____.
9. Biodegradable detergents are made of _____ (branched / straight) chain hydrocarbons

Answers:
1. functional group
2. C_nH_{2n_2}
3. root word
4. Unsaturated
5. ethene
6. absolute alcohol
7. Blue, Red
8. Saponification
9. straight

III. Match the following:
1. Functional group –OH    A. Benzene
2. Heterocyclic                    B. Potassium stearate
3. Unsaturated                    C. Alcohol
4. Soap                                D. Furan
5. Carbocyclic                      E. Ethene

Answers:
1. C
2. D
3. E
4. B
5. A

IV. Assertion and Reason:
1. Assertion: Detergents are more effective cleansing agents than soaps in hard water.
Reason: Calcium and magnesium salts of detergents are water soluble.
a) A and R are correct, R explains the A.
b) A is correct, R is wrong.
c) A is wrong, R is correct.
d) A and R are correct, R doesn’t explains A.

2. Assertion: Alkanes are saturated hydrocarbons.
Reason: Hydrocarbons consist of covalent bonds.
a) A and R are correct, R explains the A.
b) A is correct, R is wrong.
c) A is wrong, R is correct.
d) A and R are correct, R doesn’t explains A.

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