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Extraction of Aluminium

In the leachi...

Question

In the leaching method, bauxite ore is digested with a concentrated solution of NaOH that produces 'X'. When $C O_{2}$ gas is passed through the aqueous solution of 'X', a hydrated compound 'Y' is precipitated.
'X' and 'Y' respectively are:

A

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

and

A l_{2} (C O_{3})_{3} \cdot x H_{2} O

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B

A l (O H)_{3}

and

A l_{2} O_{3} \cdot x H_{2} O

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C

N a A l O_{2}

and

A l_{2} (C O_{3})_{3} \cdot x H_{2} O

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D

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

and

A l_{2} O_{3} \cdot x H_{2} O

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Solution

The correct option is D $N a [A l (O H)_{4}]$ and $A l_{2} O_{3} \cdot x H_{2} O$
In the leaching method, bauxite ore is digested with a concentrated solution of NaOH that produces 'X'.

When $C O_{2}$ gas is passed through the aqueous solution of 'X', a hydrated compound 'Y' is precipitated.

'X' and 'Y' are $N a [A l (O H)_{4}]$ and $A l_{2} O_{3} \cdot x H_{2} O$ respectively.

Hence, the correct option is $D$ .

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Similar questions

Q. In the following sets of reactants which two sets exhibit the amphoteric character of

A l_{2} O_{3} . x H_{2} O

A l_{2} O_{3} . x H_{2} O

O H^{-} (a q)

A l_{2} O_{3} . x H_{2} O

H_{2} O (l)

A l_{2} O_{3} . x H_{2} O

H^{+} (a q)

A l_{2} O_{3} . x H_{2} O

N H_{3} (a q)

State True or False.

A l_{2} O_{3}

N a O H

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

.

Q. A metal X reacts with aqueous NaOH solution to form Y and a highly inflammable gas. Solution Y is heated and

C O_{2}

IS poured through it. Z precipitates out and

N a_{2} C O_{3}

is formed. Z on heating gives

A l_{2} O_{3}

. Identify X, Y and Z.

Statement :

(A l_{2} O_{3})

(S i O_{2})

get dissolved in a concentrated solution of NaOH under pressure.

A l (O H)_{3}

is precipitated when

C O_{2}

is passed or by seeding with some freshly precipitated

A l (O H)_{3}

If the statement is true enter 1 else 0.

Q. The complex formed with

A l_{2} O_{3}

is leached from bauxite using concentrated

N a O H

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