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Oxides and Oxoanions

Bauxite ore i...

Question

Bauxite ore is treated with $c o n c . N a O H$ solution at 500 K and 35 bar pressure for few hours and filtered hot. In the fittrate, the species present are

A

N a A l (O H)_{4}

and

N a_{2} S i O_{3}

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B

N e A l (O H)_{4}

only

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C

N a_{2} S i O_{3}

and

N a_{2} T i (O H)_{6}

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D

N a_{2} S i O_{3}

only

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Solution

The correct option is A $N a A l (O H)_{4}$ and $N a_{2} S i O_{3}$
Both $A l_{2} O_{3}$ and $S i O_{2}$ dissolve in $N a O H$ as $N a A l (O H)_{4}$ and $N a_{2} S i O_{3}$ respectively.

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