Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test General Science Chemistry Equilibrium
Which of the following is NOT a natural acid-base indicator?
1
Red cabbage leaves
2
Thyme leaves
3
Geranium flowers
4
More than one of the above
5
None of the above