Question

(A) $S{O}_2$ and $C{O}_2$ both turn lime water milky.

(B) $S{O}_2$ also turns $K_{2}C{r}_2{O}_7/H^{+}$ green.

(C) $O_2$ is soluble in pyrogallol turning it black.

These gases are to be detected in order by using these reagents. The order is :

• A. $\left(A\right)$, $\left(B\right)$, $\left(C\right)$
• B. $\left(B\right)$, $\left(C\right)$, $\left(A\right)$
• C. $\left(B\right)$, $\left(A\right)$, $\left(C\right)$
• D. $\left(A\right)$, $\left(C\right)$, $\left(B\right)$

Answer 1

Answer: (C)

$\left(B\right)$, $\left(A\right)$, $\left(C\right)$

These gases are to be detected in order (B), (A), (C)

First $S{O}_2$ will turn $K_{2}C{r}_2{O}_7/H^{+}$green
Then $C{O}_2$ will turn lime water milky.
Then $O_2$ will dissolve in pyrogallol turning it black.