Question

Class 7 science chapter 5
Answer it.​

Answer 1

Basic Concept :-

A blue litmus turns red with an acid and stays blue when reacts with a base.

A red litmus remains red with an acid and turns blue with a base.

Keeping these points in mind, we can solve the given questions.

1. turns blue - remains blue - basic
2. remains red - turns red - acidic
3. turns blue - remains blue - basic
4. remains red - remains blue - neutral ( depends upon the sample of the water - please note this point)*
5. turns blue - remains blue - basic
6. remains red - remains blue - neutral
7. remains red - turns red - acidic
8. remains red - turns red - acidic
9. remains red - remains blue - neutral
10. turns blue - remains blue - basic
11. turns blue - remains blue - basic
12. turns blue - remains blue - basic

* Tap water samples differ from region to region. It depends upon the quality of water. The answer given here is actually based on what tap water must actually be. Tap water can be basic or acidic.