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Q.

A mixture of $N a_{2} C O_{3}$ and $N a_{2} S O_{3}$ is treated with dilute $H_{2} S O_{4}$ in a setup such
that the gaseous mixture emerging can pass first through a beaker containing
solution of $B a C l_{2}$ and then the remaining gaseous mixture is passed through
another beaker containing $K_{2} C r_{2} O_{7}$ acidified with dilute $H_{2} S O_{4}$ .
Which of the following will you observe?

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a

The $B a C l_{2}$ solution remains unaffected and the acidified dichromate solution turns green

b

The $B a C l_{2}$ solution gives a white precipitate and the acidified dichromate solution turns blue

c

Both the solutions remain unaffected

d

The $B a C l_{2}$ solution gives a white precipitate and the acidified dichromate solution remains unaffected

answer is D.

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Detailed Solution

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$C O_{2} ↑ \overset{B a C l_{2} s o l^{n}}{\to} w h i t e p p t S O_{2} ↑ \overset{B a C l_{2} s o l^{n}}{\to} w h i t e p p t$

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A mixture of Na2CO3 and Na2SO3 is treated with dilute H2SO4 in a setup suchthat the gaseous mixture emerging can pass first through a beaker containingsolution of BaCl2 and then the remaining gaseous mixture is passed throughanother beaker containing K2Cr2O7 acidified with dilute H2SO4. Which of the following will you observe?