Name the gas that
(i) Does not affects filter paper dipped is acidified KMnO₄
(ii) Turns moist starch iodide paper blue black
(iii) Decolourises acidified KMnO₄ solution
(iv) Turns colourless PbNO3 solution into black
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I) CO2
Carbon dioxide gas does not affect the filter dipped in acidified KmNO4.
II) Cl
Chlorine turns moist starch iodide paper blue-black because the iodide ions on the paper are oxidised to iodine and the starch reacta to give a blue black compound.
III) SO2
The sulphur dioxide gas changes the colour of acidified KmNO4 from purple to colourless.
IV) H2S
Hydrogen sulphide gas when passed through a lead nitrate solution gives a black precipitate.
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