Chemistry · Acids, Bases and Salts
मानव के मुख में किस pH मान पर दाँतों का क्षय (tooth decay) शुरू होने लगता है?
- 1ठीक 6.5
- 25.5 से नीचे✓
- 38 से ऊपर
- 47 और 8 के बीच
सही उत्तर देखें
5.5 से नीचे
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