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Which inorgan...

Question

Which inorganic precipitate in porous walls acts as semipermeable membrane?

A

Calcium phosphate

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B

Barium oxalate

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C

Nickel phosphate

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D

Copper ferrocyanide

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Solution

The correct options are
A Calcium phosphate
D Copper ferrocyanide
The semipermeable membranes used in the osmosis process can be an animal membrane, paper, etc. It should allow only the solvent particles and not the larger solute particles.
Traube, a German chemist, found that films of certain gelatinous precipitates, especially of cupric ferrocyanide, $C u_{2} [F e (C N)_{6}]$ , and Calcium phosphate are perfectly semipermeable membrane.

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Q. Which inorganic precipitate acts as semipermeable membrane?

Q. Assertion :Formation of semipermeable membrane between the walls of porous pot on hanging pot filled with

C u S O_{4} (a q)

partially dipped in

K_{4} F e (C N)_{6}

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C u^{2 +}

F e (C N)_{6}^{4 -}

gives insoluble gelatinous mass of

C a_{2} [F e (C N)_{6}]_{4}

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