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7th Andhra Pradesh Board
IMPORTANT
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Turmeric stains on white clothes, when washed with soap, turns red. Why?

Important Questions on Acids and Bases

MEDIUM
7th Andhra Pradesh Board
IMPORTANT
Science Class VII>Chapter 2 - Acids and Bases>Improve your learning:>Q 7
Ammonia is present in window cleaners. It turns red litmus blue. What is its nature?
MEDIUM
7th Andhra Pradesh Board
IMPORTANT
Science Class VII>Chapter 2 - Acids and Bases>Improve your learning:>Q 8
What is the nature of urea? Is it acidic, basic or neutral? How can we verify it?
MEDIUM
7th Andhra Pradesh Board
IMPORTANT
Science Class VII>Chapter 2 - Acids and Bases>Improve your learning:>Q 9
Red litmus is dipped in a solution. It remains red. What is the nature of the solution? Explain your answer. 
MEDIUM
7th Andhra Pradesh Board
IMPORTANT
Science Class VII>Chapter 2 - Acids and Bases>Improve your learning:>Q 10
What is the effect of basic substances on turmeric paper?
MEDIUM
7th Andhra Pradesh Board
IMPORTANT
Science Class VII>Chapter 2 - Acids and Bases>Improve your learning:>Q 11
Can flowers and turmeric papers also be called as indicators? Why?
MEDIUM
7th Andhra Pradesh Board
IMPORTANT
Science Class VII>Chapter 2 - Acids and Bases>Improve your learning:>Q 12
Indicators show different colours in acidic and basic solutions.
MEDIUM
7th Andhra Pradesh Board
IMPORTANT
Science Class VII>Chapter 2 - Acids and Bases>Improve your learning:>Q 12

Correct the statement if it is wrong:

Sodium hydroxide turns blue litmus red.

MEDIUM
7th Andhra Pradesh Board
IMPORTANT
Science Class VII>Chapter 2 - Acids and Bases>Improve your learning:>Q 12

Correct the statement if it is wrong:

Tooth decay is caused due to the presence of base.