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Chemical Properties of Boron Family

Al 2 O 3 diss...

Question

${A l}_{2} O_{3}$ dissolves in $N a O H$ to form:

{A l}_{2} O_{3}

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

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{N a}_{3} [A l {(O H)}_{6}]

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{N a}_{3} A l O_{3}

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Solution

The correct option is B $N a [A l {(O H)}_{4}]$
$A l_{2} O_{3}$ dissolves in NaOH to form $N a [A l {(O H)}_{4}]$ .
$A l_{2} O_{3} + 2 N a O H + 3 H_{2} O \to 2 N a [A l {(O H)}_{4}]$
Note: $A l_{2} O_{3}$ is amphoteric oxide and reacts with acids as well as bases.

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