Match the compounds with their properties

Answer

`A-r,s " " B-p " " C-r,s " " D-q`

Explanation

`A-r,s " " B-p " " C-r,s " " D-q`
`CaCO_(3) or BaCO_(3) +H_(2)O overset(Excess CO_2) rarr Ca^(2+)underset("Soluble bicarbonate")((HCO_3^-) or Ba^(2+)(HCO_3^-)_2)`
`{:(BaCO_3 or CaCO_3 + dil H_2SO_4 rarr BaSO_4 or CaSO_4 +H_2O + CO_2),(" White ppt"):}`
When powdered plaster of Paris `CaSO_(4). 1//2 H_2O` is mixed with the correct amount of water, it sets into a solid mass of `CaSO_(4).2H_(2)O` (gypsum) due to hydration of molecules and their rearragement. Due to anomalous behaviour , `Be(OH)_2` resembles `Al(OH)_2` and is amphoteric in nature.