Analytical Chemistry Question 6
Question: A salt gives violet vapours when treated with conc. $ H_2SO_4 $ . It contains
[DPMT 1981; CPMT 1971]
Options:
A) $ C{l^{-}} $
B) $ {I^{-}} $
C) $ B{r^{-}} $
D) $ NO_3^{-} $
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Answer:
Correct Answer: B
Solution:
Iodine vapours are violet
$ \therefore $ the salt must contain $ {I^{-}} $ as $ KI+H_2SO_4\to KHSO_4+HI $
$ 2HI+H_2SO_4\to \underset{\text{violet vapour}}{\mathop{I_2+2H_2O+SO_2}} $
BETA
