Question
Question: A substance on treatment with dilute H<sub>2</sub>SO<sub>4</sub> liberates a colourless gas produces...
A substance on treatment with dilute H2SO4 liberates a colourless gas produces, (i) turbidity with baryta water and, (ii) turns acidified dichromate solution green. These reactions indicate the presence of : -
A
CO3–2
B
S–2
C
SO32–
D
NO2–
Answer
SO32–
Explanation
Solution
SO32– + 2H+ ® H2O + SO2
Ba(OH)2 + SO2 ® BaSO3 + H2O
(Insoluble turbidity)
K2Cr2O7 + H2SO4 + SO2 ®
K2SO4 + Cr2(SO4)3 + H2O