Blue litmus solutions is added to two test tubes A and B containing dilute HCl and NaOH solution respectively. In which test tube a colour change will be observed? State the colour change and give its reason.
Blue litmus solutions is added to two test tubes A and B containing dilute HCl and NaOH solution respectively. In which test tube a colour change will be observed? State the colour change and give its reason.
Official answer
When dilute hydrochloric acid is added to sodium carbonate, brisk effervescence is observed due to the evolution of carbon dioxide gas. The reaction involved is:
Marking scheme
- 1.1 mark for describing the observation and 1 mark for writing the balanced chemical equation.
Hint
Recall the chemical properties of acids and bases and write the balanced chemical equation for the reaction involved.
Quick oral answer
When dilute hydrochloric acid is added to sodium carbonate, brisk effervescence is observed due to the evolution of carbon dioxide gas.
Common mistakes
- 1.Students may incorrectly write the balanced chemical equation.
Analysis and explanation
This question requires the student to recall the chemical properties of acids and bases and write the balanced chemical equation for the reaction involved.
Interesting facts
Sodium carbonate is commonly used in the manufacture of glass and paper.
Question details
Q22 of 37 questions
- Board
- CBSE
- Class
- Class 10
- Subject
- Science
- Year
- 2019
- Section
- Section E
- Marks
- 2
- Type
- Short Answer
- Chapter
- Acids, Bases and Salts
- Topic
- Acids, Bases and Salts
- Bloom's level
- Remembering
- Syllabus topic
- Chemical Properties of Acids and Bases
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Frequently asked questions
How many marks does this question carry in CBSE Class 10 Science 2019?
This question carries 2 marks in the CBSE Class 10 Science 2019 examination.
Which chapter does this question come from in Science?
This question is from the chapter "Acids, Bases and Salts" in the CBSE Class 10 Science syllabus.
What topic does this question cover in Science?
This question covers the topic "Acids, Bases and Salts" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2019 paper?
This is a Short Answer question from Section E in the CBSE Class 10 Science 2019 paper.