Which sulfate is soluble?
calcium sulfate
gold(ii) sulfate
barium sulfate
mercury(i) sulfate

Gold(II) sulphate is soluble

Explanation:

According to solubility rule, all sulphates are soluble except

One of the reason for gold sulphate to be a soluble salt is that both gold(II) and sulphate are bigger in size. Therefore their lattice energy is low as lattice energy is inversely proportional to sum of radius of cation and anion.

Hence lattice structure of gold sulphate can be easily disrupted and make constituting ions to get soluble.

explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.

two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.