The noble gas used in advertising signboards is:

1. Helium
2. Neon
3. Argon
4. Krypton

A metal with melting point less than 50°C is:

1. Gallium
2. Iron
3. Gold
4. Aluminium

Rust is a hydrated oxide of iron which is:

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

Aluminium is not used to make:

1. Foils
2. Wires
3. Fireworks
4. utensils