Question

Which of the following ppt.(s) of sulphite ion have white color?

• A. $A{g}_{2}S{O}_3$
• B. $SrS{O}_3$
• C. $CaS{O}_3$
• D. $BaS{O}_3$

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A $A{g}_{2}S{O}_3$
B $CaS{O}_3$
C $SrS{O}_3$
D $BaS{O}_3$

$A{g}_{2}S{O}_3$ is a white substance , its colour changing under the influence of light to purple and then to black.

$S{O}_3^{2-}+A{g}^{2+}\to \underset{Whiteppt}{A{g}_{2}S{O}_3\downarrow }$

$SrS{O}_3$ is a white crystalline powder and occurs in nature as the mineral celestine.

$S{O}_3^{2-}+S{r}^{2+}\to \underset{Whiteppt}{SrS{O}_3\downarrow }$

$CaS{O}_3$ white solids. It is most notable as the product of flue gas desulfurization.

$S{O}_2\uparrow +Ca(OH{)}_2\to \underset{Milkyppt}{CaS{O}_3\downarrow }+H_{2}O$

Salt of sulfurous acid with the chemical formula $BaS{O}_3$. It is a white powder which is used in paper manufacturing.

$S{O}_3^{2-}+B{a}^{2+}\to \underset{Whiteppt}{BaS{O}_3\downarrow }$

All are white.