Question

Dry SO2 gas does not turn dry blue litmus to red in color whereas when SO2 is passed over moised blue litmus it turn red in color. Give Reason.

Answer 1

Answer:

• Acid turn blue litmus red.
• To turn blue litmus to red acidic properties are required.
• The H+ ions causes acidic properties.
• Dry SO2 doesn't turn dry blue litmus red due to absence of H+ ions.
• But when SO2 is passed through moist blue litmus paper,it reacts with it and gives rise to H+ ions due to the presence of moisture(H20) in blue litmus paper,hence give rise to acidic properties ,as a result turns blue litmus turns red.[It actually causes protonation that is release of H+ ions]

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