Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test General Science Chemistry Equilibrium
Which one of the following can be used as an acid–base indicator by a visually impaired student?
1
Litmus
2
Turmeric
3
Vanilla essence
4
More than one of the above
5
None of the above