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451.

State the main constituent metal in each alloy : 1. Duralumin 2. Brass 3. Stainless steel

Answer»

1. Aluminium 

2. Copper 

3. Iron 
Discussion
452.

State the property of the metal being utilized in the following : 1. Zinc in Galvanization 2. Aluminium in Thermite welding

Answer»

Use of metal : 

(a) Zinc in Galvanization 

(b) Aluminium in Thermite welding

Property : 

(a) Zinc forms a protective layer of zinc oxide which prevents rusting of iron. 

(b) Strong affinity for oxygen.
Discussion
453.

Correct the following statements. — Haematite is the chief ore of aluminium. 

Answer»

Haematite is the chief ore of iron.

OR

Bauxite is the chief ore of aluminium.
Discussion
454.

The metal oxide which can react with acid as well as alkali is : A. Silver oxide B. Copper (II) oxide C. Aluminium oxide D. Calcium oxide

Answer»

C. Aluminium oxide
Discussion