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Chemistry CBSE Live product
Class 7 (2026-27)
Exploring Substances: Acidic, Basic, and Neutral
Introduction to acids and bases
7.
Effect of litmus paper
Question:
6
m.
Answer the following question:
The table below shows the effect of different substances on red and blue litmus papers. Choose the correct option for each case.
Sample
Effect on red litmus paper
Effect on blue litmus paper
i.
Basic solution
Red litmus → yellow
Red litmus → pink
Red litmus → No change
Red litmus → Blue
Blue litmus → Red
Blue litmus → pink
Blue litmus → No change
Blue litmus → yellow
ii.
Curd
Red litmus → yellow
Red litmus → Blue
Red litmus → pink
Red litmus → No change
Blue litmus → Red
Blue litmus → yellow
Blue litmus → No change
Blue litmus → pink
iii.
Salt solution
Red litmus → Blue
Red litmus → pink
Red litmus → yellow
Red litmus → No change
Blue litmus → Red
Blue litmus → pink
Blue litmus → yellow
Blue litmus → No change
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