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Coordination Complexes

Potassium alu...

Question

Potassium alum, $K A l (S O_{4})_{2} \cdot 12 H_{2} O$ is obtained in the form of octahedral crystals when a solution of $K_{2} S O_{4}$ and $A l_{2} (S O_{4})_{3}$ is concentrated by evaporation. Suggest specific experiments to specify whether it is a complex or double salt.

A

One can determine conductance

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B

One can determine freezing points

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C

One can detect

A l^{3 +}, S O_{4}^{2 -}, K^{+}

.

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D

All of these

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Solution

The correct option is C All of these
Double salts are salts containing more than one cation or anion, and is obtained by combination of two different salts which were crystallized in the same regular ionic lattice. When dissolved in water, a double salt completely dissociates into simple ions while complexes do not; the complex ion remains unchanged.

a) By measuring conductance we can measure the quantity of ions. If conducatnce is high that means there are more no. of ions which confirms it is double salt

b) By measuring freezing point we can measure the quantity of ions. Low freezing point means there are more no.of ions which are depressing the freezing point and which confirms it is double salt

c) The detection of different ions can also confirm whether it is a double salt or a complex.

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solution is treated with KCN solution, species formed does not give tests of

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solution is treated with

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1

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