Teaching BPSC बिहार मध्य विद्यालय (6 to 8) शिक्षक भर्ती 4.0 Mock Test General Science Chemistry Equilibrium

Human body works in the pH range of:

1
6.8 - 7.2
2
7.0 - 7.8
3
6.5 - 7.5
4
More than one of the above
5
None of the above
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