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Chemistry CBSE Live product
Class 7 (2026-27)
Exploring Substances: Acidic, Basic, and Neutral
Neutralisation in Daily Life
6.
Importance of pH
Question:
3
m.
Read the following question and answer:
A dentist finds that a boy’s mouth pH is too low due to sugary foods.
i. Name the substance causing tooth decay.
ii. Treatment to be done.
iii. Identify the type of reaction.
i.
The substance present is
sodium hydroxide
hydrochloric acid
acids produced by bacteria
vinegar
ii.
Treatment:
Apply lime paste
Paste containing mild bases
Apply vinegar
Apply baking soda paste
iii.
Type of reaction:
Combustion
Neutralisation
Oxidation
Precipitation
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