Read the following statements: I. When a red litmus paper is dipped into reaction mixture of a saponification reaction, it turns blue and the reaction is exothermic. II. When a blue litmus paper is dipped into reaction mixture of a saponification reaction, its colour does not change and the reaction is exothermic. III. When a red litmus paper is dipped into reaction mixture of a saponification reaction, its colour does not change and the reaction is endothermic. IV. When a blue litmus paper is dipped into reaction mixture of a saponification reaction, its colour does not change and the reaction is endothermic. Which of the above statements are correct:
Read the following statements: I. When a red litmus paper is dipped into reaction mixture of a saponification reaction, it turns blue and the reaction is exothermic. II. When a blue litmus paper is dipped into reaction mixture of a saponification reaction, its colour does not change and the reaction is exothermic. III. When a red litmus paper is dipped into reaction mixture of a saponification reaction, its colour does not change and the reaction is endothermic. IV. When a blue litmus paper is dipped into reaction mixture of a saponification reaction, its colour does not change and the reaction is endothermic. Which of the above statements are correct:
Options
Official answer
Option A is correct (I and II).
Marking scheme
- 1.1 Mark for selecting the correct option A.
Hint
Recall that saponification involves a strong alkali () and releases heat during the formation of soap.
Quick oral answer
Saponification is an exothermic reaction that produces a basic mixture. Consequently, it releases heat and turns red litmus paper blue.
Common mistakes
- 1.Thinking saponification is endothermic because heat is sometimes applied initially to start the reaction.
- 2.Confusing the basic nature of soap with an acidic nature.
Analysis and explanation
Saponification is the alkaline hydrolysis of fats or oils using a strong base like sodium hydroxide () to produce soap and glycerol.
- Nature of the reaction mixture: Because a strong base () is used as a reactant, and soap itself is a salt of a strong base and weak fatty acid, the reaction mixture is highly basic (alkaline). Therefore, it turns red litmus paper blue (Statement I is correct) and has no effect on blue litmus paper (Statement II is correct).
- Thermal nature of the reaction: Saponification is an exothermic chemical reaction, meaning it releases heat energy to the surroundings, making the reaction mixture warm.
Since Statements I and II are correct, Option A is the correct choice.
Interesting facts
The term 'saponification' literally means 'soap-making' and comes from the Latin word 'sapo', which means soap.
Question details
Q28 of 40 questions
- Board
- CBSE
- Class
- Class 10
- Subject
- Science
- Year
- 2013
- Section
- Section B
- Marks
- 1
- Type
- MCQ
- Chapter
- Chemical Reactions and Equations
- Topic
- Saponification Reaction
- Bloom's level
- Understanding
- Syllabus topic
- Types of chemical reactions: exothermic reactions, practical skills
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Frequently asked questions
How many marks does this question carry in CBSE Class 10 Science 2013?
This question carries 1 mark in the CBSE Class 10 Science 2013 examination.
Which chapter does this question come from in Science?
This question is from the chapter "Chemical Reactions and Equations" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "Saponification Reaction" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2013 paper?
This is a MCQ question from Section B in the CBSE Class 10 Science 2013 paper.