railway RRB Technician Grade 3 Mock Test 2024 General Science Chemistry Equilibrium

অশ্রুর পিএইচ(pH) মান কত?

1
6.5 থেকে 7.6
2
8.5 থেকে 8.8
3
6.0 থেকে 6.6
4
6.3 থেকে 7.2
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