Analytical Chemistry Question 248
Question: $ [X]+H_2SO_4\xrightarrow{{}}[Y] $ a colourless gas with irritating smell,
$ [Y]+K_2Cr_2O+H_2SO_4\xrightarrow{{}} $ green solution. [X] and [Y] is:
Options:
A) $ SO_3^{2-},SO_2 $
B) $ C{l^{-}},HCl $
C) $ {S^{2-}},H_2S $
D) $ CO_3^{2-},CO_2 $
Show Answer
Answer:
Correct Answer: A
Solution:
[a] $ SO_2 $ and $ H_2S $ both being reducing agents, can turn acidified dichromate solution green. $ SO_2 $ can be obtained by the action of acid upon sulphite while $ H_2S $ is evolved by the action of acid upon sulphide. However, $ SO_2 $ has a burning sulphur smell which is irritating. $ H_2S $ has rotten egg like smell.
BETA
