Q. Which of the following salt would give SO_{2} with hot and dil.H_{2}SO_{4} and also decolourises Br_{2} water?
A) Na_{2} SO_{3}
B) NaHSO_{4}
C) Na_{2} SO_{4}
D) Na_{2}S
Explanation
(a)
Na_{2} SO_{3} reacts with hot and dil, H_{2}SO_{4} to give SO_{2} gas which decolourise bromine water
Na_{2}SO_{3}+ H_{2}SO_{4}⟶ Na_{2}SO_{4}+SO_{2}+H_{2}O
Br_{2}+ H_{2}O⟶2HBr+[O]
SO_{2}+[O]⟶SO_{3}
_{decolourisation of bromine water}
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.