A to F below relate to the source and extraction of either zinc or aluminium:A. Bauxite
B. Coke
C. Cryolite
D. Froth floatation
E. Sodium hydroxide solution.
F. Zinc blend
Fill in the blanks using the most appropriate words from A to F.
The ore from which aluminum is extracted must first be treated with ___________ so that pure aluminium oxide can be obtained

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Solution

Sodium Hydroxide ( $NaOH$ ) is used in the extraction process of Aluminum.
It can be used for removing impurities present in the ore of Aluminum which is Bauxite.
It will dissolve the impurities of Bauxite of Aluminum by forming red mud.
The reaction is, $\underset{B a u x i t e}{A l_{2} O_{3} . 2 H_{2} O (s)} + \underset{S o d i u m h y d r o x i d e}{2 N a O H (l)} \to \underset{S o d i u m a l u m i n a t e}{2 N a A l O_{2} (s)} + 3 \underset{Water}{H_{2} O (l)}$
Hence, the ore from which aluminum is extracted must first be treated with Sodium Hydroxide so that pure aluminum oxide can be obtained

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Similar questions

Q. A to F below relate to the source and extraction of either zinc or aluminium.
A. bauxite
B. coke
C. cryolite
D. froth flotation
E. sodium hydroxide solution
F. zinc blende.
(a) Write down the three letters each from the above list which are relevant to:
(i) zinc
(ii) aluminium
(b) Fill in the blanks using the most appropriate words from A to F:
(i) The ore from which aluminium is extracted must first be treated with _________ so that pure aluminium oxide can be obtained.
(ii) Pure aluminium oxide is dissolved in _________ to make a conducting solution.
(c) Write the formula of cryolite.

(a) A to F below relate to the source and extraction of either zinc or aluminium:

A.Bauxite, B.Coke,

C. Cryolite D.Froth floatation, E.Sodium hydroxide solution, F.Zinc blende.

(i) Write down the three letters each from the above list which are relevant to:

1.Zinc, 2.Aluminium.

(ii) Fill in the blanks using the most appropriate words form A to F.

1.The ore from which aluminium is extracted must first be treated with ...................so that pure aluminium oxide can be obtained.

2.Pure aluminium oxide is dissolved in .............. to make a conducting solution.
(iii) Write the formula of cryolite.

For each substance listed below, explain its significance in the extraction of aluminium:

(a) Bauxite, (b) Sodium hydroxide,

Q. In order to obtain one tonne 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 to show the action of heat on aluminium hydroxide.
(c) (i) Write the formula of cryolite.
(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 this electrolytic process?
(iv) Write the equation for the reaction which takes place at the cathode.
(d) In construction work, why is the alloy of aluminium, duralumin used rather than pure aluminium.

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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