Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test General Science Chemistry Chemistry in Everyday Life
The breath test conducted by police to check drunken driver has which one of the following on the filter paper?
1
Potassium dichromate-sulfuric acid
2
Potassium permanganate-sulfuric acid
3
Silica gel coated with silver nitrate
4
More than one of the above
5
None of the above