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The number of moles of sulphate ions present in the general formula of 4 moles of alum ?

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answer is 12.

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Detailed Solution

The molecular formula of potash alum is $K_{2} S O_{4} . A l_{2} (S O_{4})_{3} . 24 H_{2} O$ .
In this potash alum, there are two moles of potassium ions, two moles of aluminium ions, three moles of sulphate ions and twenty four moles of water molecules.
There are a total of 32 moles of compounds together to form potash alum. Therefore, one mole alum has 3 sulphate and 4 moles has 12 sulphate.

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