Which of the following is precipitated when an arsenate reacts with a magnesia mixture?

M g H A s O_{3}

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M g_{2} A s O_{3}

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M g N H_{4} A s O_{4} . 6 H_{2} O

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M g_{2} N H_{4} A s O_{4} .6 H_{2} O

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Solution

The correct option is C $M g N H_{4} A s O_{4} . 6 H_{2} O$
Magnesia mixture: A mixture of magnesium chloride, ammonium chloride and ammonia solution.It reacts with arsenate and forms magnesium ammonium arsenate $M g N H_{4} A s O_{4} . 6 H_{2} O$ as final product.

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