The appropriate test paper to use in the above experiment is moist
- litmus psper
- potassium heptaoxodichromate (IV) paper
-
lead (ll) trioxonitrate (V) paper
- universal indicator paper
The correct answer is: C
Explanation
Hydrogen Sulphide can easily be identified by bringing a strip of filter paper soaked in Lead(II) ethanoate solution or Lead(II) nitrate(V) solution into the gas.
H\(_2\)S turns the paper dark brown or black. The change in colour is as a result of formation of precipitate of black lead(II) Sulphide.