Q20
Qualitative determination of H2S in gases is done by wetting a filter paper with . . . . . . . . and keeping it in the gas stream. The extent of brown or black colouration of the filter paper givesa rough estimate of H2S present in the gas.
A.
lead acetate
AnswerB.
methyl orange
C.
phenolphthalein
D.
ammonium hydroxide
Answer: Option A
Solution
Answer: Option A
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