P-Block Elements Ques 595
Question: From the following information $ X+H_2SO_4\to Y $ (a colourless arid irritating gas) $ Y+K_2Cr_2+H_2SO_4\to $ (green coloured solution) Identify the pair X and Y.
Options:
A) $ \overline{C}r,HCl $
B) $ SO_3^{2-},S{{O}_2} $
C) $ {{S}^{2-}},H_2S $
D) $ CO_3^{2-},CO_2 $
Show Answer
Answer:
Correct Answer: B
Solution:
$ \underset{(X)}{\mathop{SO_3^{2-}}}+2{{H}^{\oplus }}\to SO_2+H_2O $ $ \underset{(Y)}{\mathop{3SO_2}}+K_2Cr_2O_7+H_2SO_4\to $ $ K_2SO_4+\underset{\begin{smallmatrix} Greencoloured \\ solution \end{smallmatrix}}{\mathop{Cr_2{{(SO_4)}_2}+H_2O}} $
