Question

Which one of the following procedures is correct to detect the acidic nature of SO2 gas?
(1) Insert wet blue litmus paper in a gas jar filled with SO2 gas
(2) Insert wet red litmus paper in a gas jar filled with SO2 gas
(3) Insert dry blue litmus paper in a gas jar filled with SO2 gas
(4) Insert dry red litmus paper in the gas jar filled with SO2 gas

Answer 1

Answer:

option a

insert wet blue litmus paper