Question

(a) Name one main ore of Aluminium. Write its formula. Which two main impurities are associated with this ore?
(b) Describe with chemical equations, the method employed for the enrichment of the above named ore.
OR
(a) Why is sulphuric acid called ‘King of Chemicals’?
(b) Describe the three chemical reactions that take place during the conversion of sulphur dioxide to sulphuric acid in the ‘Contact Process’.
(c) Why should water be never added dropwise to concentrated sulphuric acid?

Answer 1

Hey mate here is your answer

A)The main ore is bauxite (Al2o3.h2o) Impurities-

1.sand

2.silica

(SiO2)

B)Concentrated sulphuric acid is called the king of chemicals as it is a very strong acid and is highly corrosive.  

C)The three chemical reactions that take place during the conversion of sulphur dioxide to sulphuric acid in the ‘Contact Process’ are given below.

Step I: Sulphur dioxide is mixed with air and passed over vanadium (V) oxide catalyst heated to 450C to form sulphur trioxide.

Step II: Sulphur trioxide is dissolved in concentrated sulphuric acid to form a thick fuming liquid called oleum.

Step III: Oleum is diluted with a calculated quantity of water to obtain sulphuric acid.

D)If water is added to sulphuric acid, then a large amount of heat is evolved. This changes water to steam, which can splash the acid. Hence, it is dangerous.

I hope it helped you :)