A metal which is neither ductile nor malleable is:

1. Copper
2. Silver
3. Zinc
4. Aluminium

Rust is a hydrated oxide of iron which is:

1. Reddish brown
2. Green
3. White
4. Black

A metalloid used in the manufacture of microchips used in computer is:

1. Antimony
2. Germanium
3. Silicon
4. Arsenic

A metalloid used to make glass:

1. Sulphur
2. Germanium
3. Silicon
4. Antimony