Acids Bases and Salts MCQs Class 7
CBSE Class 7 Science – Acids, Bases and Salts MCQs with Answers & Explanations
Class: 7
Subject: Science
Section: Acids, Bases and Salts
Topic: Acids Bases and Salts MCQs Class 7
These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 7 Science examinations. Each answer includes detailed explanations to build strong conceptual clarity.
Subject: Science
Section: Acids, Bases and Salts
Topic: Acids Bases and Salts MCQs Class 7
These Multiple Choice Questions (MCQs) are designed strictly as per the NCERT syllabus, making them ideal for CBSE Class 7 Science examinations. Each answer includes detailed explanations to build strong conceptual clarity.
1. Substances that taste sour are generally:
Answer: B. Acids
Acids like lemon juice and vinegar contain acidic substances that give a sour taste.
Acids like lemon juice and vinegar contain acidic substances that give a sour taste.
2. Turmeric indicator turns red in:
Answer: B
Turmeric remains yellow in acids but turns reddish-brown in bases.
Turmeric remains yellow in acids but turns reddish-brown in bases.
3. Substances that taste bitter and feel soapy are:
Answer: B
Bases like soap solution taste bitter and feel slippery.
Bases like soap solution taste bitter and feel slippery.
4. Litmus solution is obtained from:
Answer: B
Litmus is a natural dye extracted from lichens.
Litmus is a natural dye extracted from lichens.
5. Blue litmus turns red in:
Answer: B
Acids change blue litmus to red.
Acids change blue litmus to red.
6. Red litmus turns blue in:
Answer: B
Bases change red litmus to blue.
Bases change red litmus to blue.
7. Example of natural indicator:
Answer: C
Turmeric is obtained from plants.
Turmeric is obtained from plants.
8. Neutral substances have:
Answer: C
Neutral solutions do not affect litmus.
Neutral solutions do not affect litmus.
9. Common salt is a:
Answer: C
Salt forms from acid–base reaction.
Salt forms from acid–base reaction.
10. Reaction of acid and base forms:
Answer: A
This is called neutralization.
This is called neutralization.
11. Antacids are used to:
Answer: B
They neutralize excess stomach acid.
They neutralize excess stomach acid.
12. Bee sting is treated with:
Answer: B
Bee sting is acidic; mild base relieves pain.
Bee sting is acidic; mild base relieves pain.
13. Tooth decay occurs due to:
Answer: B
Bacteria produce acids damaging enamel.
Bacteria produce acids damaging enamel.
14. Soil treatment for excess acidity uses:
Answer: A
Lime is basic and neutralizes acidic soil.
Lime is basic and neutralizes acidic soil.
15. China rose indicator turns dark pink in:
Answer: A
It shows acid presence.
It shows acid presence.
16. Phenolphthalein turns pink in:
Answer: B
It is colourless in acids, pink in bases.
It is colourless in acids, pink in bases.
17. Acid present in lemon:
Answer: B
Citric acid gives sour taste.
Citric acid gives sour taste.
18. Acid in vinegar:
Answer: B
Acetic acid is present in vinegar.
Acetic acid is present in vinegar.
19. Base present in soap:
Answer: A
Soap contains basic substances.
Soap contains basic substances.
20. Neutralization reaction produces:
Answer: A
Acid + Base → Salt + Water.
Acid + Base → Salt + Water.