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Silica

Alum shale is...

Question

Alum shale is a mixture of:

A

aluminium silicate and iron sulphide

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B

aluminium nitrate and iron sulphide

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C

aluminium hydroxide and calcium nitrate

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D

aluminium hydroxide and calcium phosphate

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Solution

The correct option is B aluminium silicate and iron sulphide
Alum shale $A l_{2} O_{3} . x S i O_{2} + F e S_{2}$ .

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H_{3} P O_{4}

formed is converted into calcium phosphate by treating with

1

mole of calcium hydroxide. Calcium phosphate obtained is :

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