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Science · 2023 · 3 marks
CBSE 2023 · Region 1 · Set 2 · Q32
Write the chemical composition of tooth enamel. Under what conditions of pH it starts corroding? Explain the reason of tooth decay and suggest one…
Write the chemical composition of tooth enamel. Under what conditions of pH it starts corroding ? Explain the reason of tooth decay and suggest one method to prevent it.
Marking-scheme solution
Calcium phosphate / Calcium hydroxyapatite
\(\displaystyle \left(\mathrm{Ca}_{3}\left(\mathrm{PO}_{4}\right)_{2}\right)\)
Tooth decay starts when the pH of the mouth is lower than 5.5.
Bacteria present in the mouth produces acid by degrading sugar and food particles.
Using Toothpaste / Cleaning the mouth after every meal.
All Acids, Bases and Salts questions2023 question paperNCERT solutions: Acids, Bases and SaltsPractice Acids, Bases and Salts →
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CBSE Class 10 Science past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.