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Science CBSE
Class 7 New
Exploring Substances: Acidic, Basic, and Neutral
Pumpa Practice Questions
6.
Effect of litmus paper
Exercise condition:
6
m.
Answer the following:
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.
Vinegar
Red litmus → pink
Red litmus → Blue
Red litmus → No change
Red litmus → yellow
Blue litmus → yellow
Blue litmus → Red
Blue litmus → No change
Blue litmus → pink
ii.
Acid rain
Red litmus → pink
Red litmus → Blue
Red litmus → yellow
Red litmus → No change
Blue litmus → Red
Blue litmus → yellow
Blue litmus → pink
Blue litmus → No change
iii.
Sugar solution
Red litmus → pink
Red litmus → Blue
Red litmus → No change
Red litmus → yellow
Blue litmus → No change
Blue litmus → Red
Blue litmus → pink
Blue litmus → yellow
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