Which inorganic precipitate in porous walls acts as a semipermeable membrane?a.) Calcium phosphateb.) Barium oxalatec.) Nickel phosphated.) Copper ferrocyanide

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Hint: A semipermeable membrane is membrane that permits only one constituent of the solution to pass through it, usually water, and does not permit diffusion of other constituents present in water. The inorganic precipitate which acts as a semipermeable membrane in porous walls is a complex compound having a yellow colour.

The molecular formula of copper ferrocyanide is $C{{u}_{2}}[Fe{{(CN)}_{6}}]$.