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Test for Ammonia

In Bayer's pr...

Question

In Bayer's process, impure bauxite is treated with caustic soda at high temperatures.

A

False

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B

True

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Solution

The correct option is B True

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Q. In aluminium extraction by the Bayer process, alumina is extracted from bauxite by sodium hydroxide at high temperatures and pressures.

{A l}_{2} O_{3} (s) + 2 O H^{-} (a q) \to 2 A l O_{2}^{-} (a q) + H_{2} O (l)

Solid impurities such as

{F e}_{2} O_{3}

S i O_{2}

are removed and then

A l {(O H)}_{4}^{-}

is reprecipitated

2 A l {(O H)}_{4}^{-} ⟶ {A l}_{2} O_{3} \cdot 3 H_{2} O (s) + 2 O H_{(a q)}^{-}

.
In the industrial world __________.

In Bayer's process, what is used to convert impure bauxite to pure alumina?

We add caustic alkali to bauxite ore during purification of bauxite.

Reason: Bauxite dissolves in caustic alkali and thus impurities can be separated

Q. When bauxite is treated with sodium hydroxide solution what happens to the iron

(I I I)

oxide (main impurity).

Q. Acetamide when treated with

B r_{2}

and caustic soda, the product obtained is:

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