Question 2 - Arrange in correct order - Chapter 6 Class 10 Geography - Manufacturing Industries - Geography

The following are the steps involved in the extraction of aluminium from bauxite ore. Arrange them in the correct order.

1. The alumina is dissolved in molten cryolite and electrolysed in a steel tank lined with graphite.

2. The bauxite ore is crushed and washed with hot water to remove impurities.

3. The aluminium is collected at the cathode and oxygen is released at the anode.

4. The alumina is obtained by heating the hydrated aluminium oxide in a rotary kiln.

Options

(A) 2 - 4 - 1 - 3

(B) 4 - 2 - 1 - 3

(C) 2 - 1 - 4 - 3

(D) 4 - 1 - 2 - 3

Answer:

The correct option is (A) - 2 - 4 - 1 - 3

Explanation

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The correct order of the steps is:

• The bauxite ore is crushed and washed with hot water to remove impurities. This is Statement 2.
• The alumina is obtained by heating the hydrated aluminium oxide in a rotary kiln. This is Statement 4.
• The alumina is dissolved in molten cryolite and electrolysed in a steel tank lined with graphite. This is Statement 1.
• The aluminium is collected at the cathode and oxygen is released at the anode. This is Statement 3 .

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