Which of the following reagents can be use to distinguish between $S O_{2}$ and $C O_{2}$ ?

Lime water

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Zinc nitroprusside paste in water

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Potassium iodate and starch

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Acidified potassium dichromate solution

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Solution

The correct options are
A Zinc nitroprusside paste in water
B Acidified potassium dichromate solution
D Potassium iodate and starch
(b) Red color compound of unknown composition is formed when moist $S O_{2}$ is brought in contact with $Z n [F e {(C N)}_{5} N O]$ (salmon color) paste in water. No color change with $C O_{2}$ .
(c) $5 S O_{2} + 2 I O_{3} + 4 H_{2} O ⟶ I_{2} + 5 S O_{4}^{2 -} + 8 H^{+}$ ;
$I_{2} + s t a r c h ⟶ b l u e c o l o r$ .
No color change observed with $C O_{2}$ .
(d) $3 S O_{2} + C r_{2} O_{7}^{2 -} + 2 H^{+} ⟶ 2 C r^{3 +} (g r e e n s o l u t i o n) + 3 S O_{4}^{2 -} + H_{2} O$
No color change observed with $C O_{2}$ .

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