Zinc pieces are added to acidified solution of `SO_(3)^(2-)`. Gas liberated can :

25 mL of H_(2)O_(2) solution were added to excess of acidified solution of KI . The iodine so liberated required 20 mL of 0.1N Na_(2)S_(2)O_(3) for titration Calculate the strength of H_(2)O_(2) in terms of normalility, percentage and volumes. (b) To a 25 mL H_(2)O_(2) solution, excess of acidified solution of KI was added. The iodine liberated required 20 mL of 0.3N sodium thiosulphate solution. Calculate the volume strength of H_(2)O_(2) solution.

When SO_(2) gas is passed through an acidified solution of K_(2)Cr_(2)O_(7) the orange colour of the solution changes to

When SO_(2) is passed through sodium carbonate solution, then CO_(2) gas is liberated. This is because

On passing SO_(2) gas through an acidified solution of K_(2)Cr_(2)O_(7)