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Which of the following gases turns lead ...

Which of the following gases turns lead acetate paper black?

A

`H_(2)S`

B

`SO_(2)`

C

`SO_(3)`

D

`H_(2)Se`

Text Solution

Verified by Experts

The correct Answer is:
1
Smell of is `H_(2)S` easily recognizable even in very small concentration. The best chemical test ( a convenient one) is the use of a fillter paper strip soaked in lead acetate solution which blackens in the presence of hydrogen sulphide:
`underset("lead ethanoate")((CH_(3)COO)_(2)Pb)+H_(2)SrarrPbS(s)+2H^(+)(aq.)`
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