1.

Which of the following reagents can be used to distinguish the SO_2 and CO_2 ?

Answer»

LIME water
Zinc nitroprusside paste in water
POTASSIUM iodate and starch
Acidified potassium dichromate SOLUTION

Solution :(B)Red COLOUR compound of unknown composition is formed when moist `SO_2` is brought in contact with `Zn[Fe(CN)_5NO]` (salmon colour) paste in water.No colour change with `CO_2`.
(C )`5SO_2+2IO_3^(-)+4H_2O to I_2+5SO_4^(2-)+8H^(+) , I_2+` starch `to` blue colour.
No colour change observed with `CO_2`.
(D)`3SO_2+Cr_2O_7^(2-)+2H^(+)to2Cr^(3+)`(GREEN solution) +`3SO_4^(2-) + H_2O`
No colour change is observed with `CO_2`


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