10th Science Book Back Answers Unit 11 – Carbon And Its Compounds:

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Samacheer Kalvi 10th Science Book Back Answers Chemistry Unit 11 – Carbon And Its Compounds:

Samacheer Kalvi 10th Science Book Subject One Mark, Two Mark Guide questions and answers are below. Check Science Book Back Questions with Answers. Take the printout and use it for exam purposes.

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10th Science – Chemistry

Unit 11 – 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
Ans : (b) alkene

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

Ans : (d) Alcohol

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

Ans : (c) – al

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
Ans : (a) C3H8 and C4H10

5. C2H5OH + 3O2 → 2CO2 + 3H2O is a .
a) Reduction of ethanol             b) Combustion of ethanol
c) Oxidation of ethanoic acid   d) Oxidation of ethanol
Ans : (b) Combustion 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%
Ans : (a) 95.5%

6. Which of the following are used as anesthetics?
a) Carboxylic acids b) Ethers c) Esters d) Aldehydes
Ans : (b) Ethers

7. TFM in soaps represents the content in soap.
a) mineral    b) vitamin    c) fatty acid   d) carbohydrate
Ans : (c) fatty acid

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

II. Fill in the blanks:

1. An atom or a group of atoms that is responsible for the chemical characteristics of an organic compound is called _______.
Ans: Functional group

2. The general molecular formula of alkynes is _____.
Ans: CnH2n–2

3. In the IUPAC name, the carbon skeleton of a compound is represented by (root word/prefix/suffix).
Ans: root word

4. (Saturated / Unsaturated) compounds decolourize bromine water. Ans: unsaturated

5. Dehydration of ethanol by conc. Sulphuric acid forms (ethene/ ethane). Ans: ethene

6. 100 % pure ethanol is called _____. Ans: absolute alcohol

7. Ethanoic acid turns litmus to. Ans: blue, red

8. The alkaline hydrolysis of fatty acids is termed as ______. Ans: Saponification

9. Biodegradable detergents are made of (branched / straight) chain hydrocarbons. Ans: straight

III. Match the following:

Question

Answer:
1. (b) Stable equilibrium of a body
2. (c) Law of force
3. (d) Flying nature of a bird
4. (a) Propulsion of a rocket

IV. Assertion and Reason
Answer the following questions using the data given below:

i) A and R are correct, R explains the A.
ii) A is correct, and R is wrong.
iii) A is wrong, and R is correct.
iv) A and R are correct, R doesn’t explain A.

1. Assertion: Detergents are more effective cleansing agents than soaps in hard water.
Reason: Calcium and magnesium salts of detergents are water-soluble.
Ans : (i) A and R are correct, R explains the A

2. Assertion: Alkanes are saturated hydrocarbons.
Reason: Hydrocarbons consist of covalent bonds.
Ans : (iv) A and R are correct, R doesn’t explain A

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