When can tooth decay start in the mouth?
Answer and explanation
Correct answer: When the pH falls below 5.5 (जब pH 5.5 से कम हो जाए)
The governing concept is the effect of pH on tooth enamel. Bacteria in the mouth can produce acids, and when the mouth becomes sufficiently acidic, enamel begins to dissolve. Tooth decay may start when the pH falls below about 5.5. Thus option A is correct. A pH of 7 is neutral, while pH 10 and pH 14 are alkaline; these values do not represent the acidic condition associated with enamel damage in this question.
Frequently asked questions
What is the correct answer to this question?
When the pH falls below 5.5 (जब pH 5.5 से कम हो जाए)
Why is this the correct answer?
The governing concept is the effect of pH on tooth enamel. Bacteria in the mouth can produce acids, and when the mouth becomes sufficiently acidic, enamel begins to dissolve. Tooth decay may start when the pH falls below about 5.5. Thus option A is correct. A pH of 7 is neutral, while pH 10 and pH 14 are alkaline; these values do not represent the acidic condition associated with enamel damage in this question.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
Student feedback
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
