\( \mathrm{SO}_{2} \) and \( \mathrm{CO}_{2} \) both turn lime wate...

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\( \mathrm{SO}_{2} \) and \( \mathrm{CO}_{2} \) both turn lime water (X) milky, \( \mathrm{SO}_{2} \) also turns \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} / \mathrm{H}^{+}(\mathrm{Y}) \) green while \( \mathrm{O}_{2} \) is soluble in pyrogallol \( (\mathrm{Z}) \)
P turning it black. These gases are to be detected in order
W. by using these reagents. The order is:
(a) \( (\mathrm{X}),(\mathrm{Y}),(\mathrm{Z}) \)
(b) \( (\mathrm{Y},(\mathrm{X}),(\mathrm{Z}) \)
(c) \( (\mathrm{X}),(\mathrm{Z}),(\mathrm{Y}) \)
(d) The correct order cannot be predicted.
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