12th Chemistry - Book Back Answers - Unit 15 Chemsitry In Everyday Life - English Medium Guides

  

 

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Tamil Nadu Board 12th Standard Chemistry - Unit 15: Book Back Answers and Solutions

    This post covers the book back answers and solutions for Unit 15 from the Tamil Nadu State Board 12th Standard Chemistry textbook. These detailed answers have been carefully prepared by our expert teachers at KalviTips.com.

    We have explained each answer in a simple, easy-to-understand format, highlighting important points step by step under the relevant subtopics. Students are advised to read and memorize these subtopics thoroughly. Once you understand the main concepts, you’ll be able to connect other related points with real-life examples and confidently present them in your tests and exams.

    By going through this material, you’ll gain a strong understanding of Unit 15 along with the corresponding book back questions and answers (PDF format).

Question Types Covered:

• 1 Mark Questions: Choose the correct answer, Fill in the blanks, Identify the correct statement, Match the following 
• 2 Mark Questions: Answer briefly 
• 3, 4, and 5 Mark Questions: Answer in detail

All answers are presented in a clear and student-friendly manner, focusing on key points to help you score full marks.

All the best, Class 12 students! Prepare well and aim for top scores. Thank you!

Unit 15 - Chemsitry In Everyday Life

I. Multiple Choice Questions

1. Which of the following is an analgesic?

a) Streptomycin

b) Chloromycetin

c) Aspirin

d) Penicillin

Answer Key:

c) Aspirin 

  

2. Antiseptics and disinfectants either kill or prevent growth of microorganisms. Identify which of the following statement is not true.

a) dilute solutions of boric acid and hydrogen peroxide are strong antiseptics.

b) Disinfectants harm the living tissues.

c) A 0.2% solution of phenol is an antiseptic while 1% solution acts as a disinfectant.

d) Chlorine and iodine are used as strong disinfectants.

Answer Key:

a) dilute solutions of boric acid and hydrogen peroxide are strong antiseptics.

  

3. Drugs that bind to the receptor site and inhibit its natural function are called

a) antagonists

b) agonists

c) enzymes

d) molecular targets

Answer Key:

a) antagonists 

  

4. Aspirin is a/an

a) acetylsalicylic acid

b) benzoyl salicylic acid

c) chlorobenzoic acid

d) anthranilic acid

Answer Key:

a) acetylsalicylic acid 

  

5. Which one of the following structures represents nylon 6,6 polymer?

(a) 

(b) 

(c) 

(d) 

Answer Key:

6. Natural rubber has

a) alternate cis- and trans-configuration

b) random cis- and trans-configuration

c) all cis-configuration

d) all trans-configuration

Answer Key:

c) all cis-configuration 

  

7. Nylon is an example of

a) polyamide

b) polythene

c) polyester

d) poly saccharide

Answer Key:

a) polyamide

  

8. Terylene is an example of

a) polyamide

b) polythene

c) polyester

d) polysaccharide

Answer Key:

c) polyester 

  

9. Which is the monomer of neoprene in the following?

a) $\mathbf{C}{\mathbf{H}}_{\mathbf{2}}\mathbf{=}\underset{\underset{\mathbf{C}\mathbf{l}}{\mathbf{|}}}{\mathbf{C}}\mathbf{-}\mathbf{C}\mathbf{H}\mathbf{=}\mathbf{C}{\mathbf{H}}_{\mathbf{2}}$

b) $\mathbf{C}{\mathbf{H}}_{\mathbf{2}}\mathbf{=}\mathbf{C}\mathbf{H}\mathbf{-}\mathbf{C}\mathbf{\equiv }\mathbf{C}\mathbf{H}$

c) CH₂ =CH $\mathbf{- }$CH=CH₂

d) $\mathbf{C}{\mathbf{H}}_{\mathbf{2}}=\underset{\underset{\mathbf{C}{\mathbf{H}}_{\mathbf{3}}}{\mathbf{|}}}{\mathbf{C}}\mathbf{-}\mathbf{C}\mathbf{H}\mathbf{=}\mathbf{C}{\mathbf{H}}_{\mathbf{2}}$

Answer Key:

a) $\mathbf{C}{\mathbf{H}}_{\mathbf{2}}\mathbf{=}\underset{\underset{\mathbf{C}\mathbf{l}}{\mathbf{|}}}{\mathbf{C}}\mathbf{-}\mathbf{C}\mathbf{H}\mathbf{=}\mathbf{C}{\mathbf{H}}_{\mathbf{2}}$

${\mathbf{ }}_{}$ 

10. Which one of the following is a bio-degradable polymer?

a) HDPE

b) PVC

c) Nylon 6

d) PHBV

Answer Key:

d) PHBV

  

11. Non stick cook wares generally have a coating of a polymer, whose monomer is

a) ethane

b) prop-2-enenitrile

c) chloroethene

d) 1,1,2,2-tetrafluoroethane

Answer Key:

d) 1,1,2,2-tetrafluoroethane

  

12. Assertion: 2-methyl-1,3-butadiene is the monomer of natural rubber

Reason: Natural rubber is formed through anionic addition polymerisation.

a) If both assertion and reason are true and reason is the correct explanation of assertion.

b) if both assertion and reason are true but reason is not the correct explanation of

assertion.

c) assertion is true but reason is false.

d) both assertion and reason are false.

Answer Key:

c) assertion is true but reason is false.

  

13. Which of the following is a co-polymer?

a) Orlon

b) PVC

c) Teflon

d) PHBV

Answer Key:

d) PHBV

  

14. The polymer used in making blankets (artificial wool) is

a) polystyrene

b) PAN

c) polyester

d) polythene

Answer Key:

b) PAN

  

15. Regarding cross-linked or network polymers, which of the following statement is incorrect?

a) Examples are Bakelite and melamine

b) They are formed from bi and tri-functional monomers

c) They contain covalent bonds between various linear polymer chains

d) They contain strong covalent bonds in their polymer chain

Answer Key:

d) They contain strong covalent bonds in their polymer chain

  

II. Short Answer Questions.

12th Chemistry

III. Long Answer Questions. 

12th Chemistry

IV. Exercise.   

12th Chemistry