[X] + H_2SO_4 to [Y] (a colourless gas with i | vedclass

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(A) The reaction of a salt $[X]$ containing sulfite ion $(SO_3^{2-})$ with dilute $H_2SO_4$ produces sulfur dioxide gas $(SO_2)$,which is a colourless

Vedclass · Accepted Answer

$SO_3^{2-}, SO_2$

Vedclass · Answer

(A) The reaction of a salt $[X]$ containing sulfite ion $(SO_3^{2-})$ with dilute $H_2SO_4$ produces sulfur dioxide gas $(SO_2)$,which is a colourless gas with a pungent,irritating smell. $SO_3^{2-} + 2H^+ 	o H_2O + SO_2 \uparrow$. Sulfur dioxide $(SO_2)$ acts as a reducing agent and turns acidified potassium dichromate $(K_2Cr_2O_7)$ solution green due to the formation of chromium$(III)$ sulfate. $K_2Cr_2O_7 + H_2SO_4 + 3SO_2 	o K_2SO_4 + Cr_2(SO_4)_3 + H_2O$. Thus,$[X]$ is $SO_3^{2-}$ and $[Y]$ is $SO_2$.

$[X] + H_2SO_4 \to [Y]$ (a colourless gas with irritating smell).
$[Y] + K_2Cr_2O_7 + H_2SO_4 \to$ green solution.
$[X]$ and $[Y]$ are:

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$[X] + H_2SO_4 \to [Y]$ (a colourless gas with irritating smell). $[Y] + K_2Cr_2O_7 + H_2SO_4 \to$ green solution. $[X]$ and $[Y]$ are: