9.1, 9.2, and 9.3

Alloy is a/an ...

• mixture of metals

• mixture of iron

• mixture of zinc

The iron ore can be reduced by ...

• Co

• CO

• Cu

1. Zinc blende is heated strongly and produce zinc oxide.

2. Zinc oxide is heated in a blast furnace with coke and produce Zn.

What is the element that can reduce the oxide to the metal in the second reaction?

• C

• O

• CO

Is it possible for Zinc to prevent Tin from rusting with the galvanizing method?

• Yes

• No

What is the major ore of aluminium on earth?

• galena

• hematite

• bauxite

Aluminium is electrolysed in ..... form.

• aqueous

• molten

What is the name of the process to get ammonia?

• Thermite

• Haber

• Blast furnace

NPK stands for?

• nitrogen, phosphor, pottasium

• nitrogen, phosphor, calcium

• nitrogen, phosphor, carbon

Ammonia has the following properties, except ...

• colorless

• soluble in water to give acid solution

• less dense than air