Exploring Substances: Acidic, Basic, and Neutral — Important Questions
CBSE · Class 7 · Science
44 important questions from Exploring Substances: Acidic, Basic, and Neutral for CBSE Class 7 Science, with answers.
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Important Questions from Exploring Substances: Acidic, Basic, and Neutral
Which of the following substances are basic in nature?
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Soap solution, Lime water, Baking soda solution
Soap solution, lime water, and baking soda solution are all basic substances. They turn red litmus paper to blue and feel slippery to touch. Vinegar and lemon juice are acidic.
Which of the following are natural indicators?
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Turmeric, Red rose petals, Litmus, Purple cabbage
Turmeric, red rose petals, litmus, and purple cabbage are all natural indicators that can show different colors in acidic and basic solutions. Plastic strips are not natural indicators.
What happens when an acid is mixed with a base?
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Neutralization occurs
When an acid is mixed with a base in proper amounts, neutralization occurs. This reaction produces salt and water, along with evolution of heat.
Turmeric paper turns red in which type of solution?
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Basic solution only
Turmeric paper turns red only in basic solutions. It remains yellow in both acidic and neutral solutions, so it cannot distinguish between acids and neutral substances.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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