railway RRB ALP (CBT 1 + CBT 2 + CBAT) Mock Test Series 2025 (New) General Science Chemistry

जेव्हा मुखाचा pH (सामू) हा _______ पेक्षा कमी होतो, तेव्हा दातांचे किडणे सुरू होते.

1
5.7
2
5.5
3
5.6
4
5.4
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