Which solution is used with the bauxite to obtain sodium meta aluminate during the conversion of bauxite into alumina?

Conc. aluminium hydroxide

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Conc. sodium hydroxide

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Calcium hydroxide

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Aluminium chloride

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Solution

The correct option is B
Conc. sodium hydroxide

Bauxite ore is finely divided and heated under pressure with concentrated caustic soda solution at 150°C to obtain sodium meta-aluminate. The following reaction is as follows:
$A l_{2} O_{3} .2 H_{2} O B a u x i t e$ $+$ $2 N a O H$ $150^{0} C - -- \to$ $2 N a A l O_{2}$ $+$ $3 H_{2} O s o d i u m m e t a a l u m i n a t e$

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Similar questions

Q. In order to obtain aluminium, the following inputs are required: Bauxite, sodium hydroxide and graphite.

Q. Aluminium is prepared industrially by Hall-Heroult process. Various steps in the concentration of ore are given below . Write them in the correct order.
i. The precipitate formed is separated , washed and strongly heated to get alumina.
ii. Crushed bauxite is leached with hot sodium hydroxide solution.
iii. Impurities are removed from the sodium aluminate solution for filtration.
iv. Solution is diluted after adding a little aluminium hydroxide , to precipitate aluminium hydroxide.

Q. Give equations for the following conversions:
(i) Ferric oxide to iron
(ii) Aluminium hydroxide to aluminium oxide
(iii) Aluminium to aluminium nitride
(iv) Aluminium to sodium aluminate

Q. When bauxite is treated with sodium hydroxide solution which of the following is produced?

In order to obtain 1 tonner of aluminium, the following inputs are required. 4 tonnes of bauxite, 150 kg of sodium hydroxide and 600 kg of graphite. The aluminium compound in bauxite is aluminium oxide and the main impurity is Iron (III) oxide. Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite.

(a) When bauxite is treated with sodium hydroxide solution, what happens to:

(i) the aluminium oxide,

(ii) the iron (III) oxide?

(b) (i) Name the process used for the purification of bauxite.

(ii) Write the equation for the action of heat on aluminium hydroxide.

(ii) Write down the word which correctly completes the following sentence.By dissolving aluminium oxide in cryolite a ..........(conducting/non conducting) solution is produced.

(iii) Why is so much graphite required for the electrolytic process?

(iv) Write the equation for the reaction which takes palace at cathode.

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Which solution is used with the bauxite to obtain sodium meta aluminate during the conversion of bauxite into alumina?

The correct option is B Conc. sodium hydroxide Bauxite ore is finely divided and heated under pressure with concentrated caustic soda solution at 150°C to obtain sodium meta-aluminate. The following reaction is as follows: Al2O3.2H2OBauxite+2NaOH 1500C−−−→2NaAlO2+3H2Osodium meta aluminate