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7. In the earth crust although the amount of aluminium is more than iron, however aluminium is costly than iron because:

A. Aluminium is more useful than iron

B. Aluminium forms more alloys than iron

C. Aluminium made equipments are more acceptable then iron equipments

D. The extraction processes of aluminium is more costly than extraction processes of iron

8. For the installation of aluminium plants in India, the minimum required parameter other than bauxite is:

A. Coke

B. Electricity

C. Labour

D. Market

9. Which of the following statement is true regarding the aluminium?

A. Aluminium hydroxide is amphoteric in nature

B. Aluminium exists in the Free State in nature

C. Nitric acid does not react with the aluminium

D. Hot and concentrated H2SO4 directly react with oxygen in which SO2 gas is released

10. The chemical formula of the plaster of Paris is:

A. CaS04.5H2O

B. 2CaS04. H2O

C. (CaS04)2. 2H2O

D. CaSO4. MgO​

Answer 1

Answer:

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