metallurgy

Which of the following processes is NOT used to concentrate the ores?

• Smelting

• Froth flotation

• Centrifugation using density

• Magnetic separation

Which property cannot be used to concentrate the ore?

• density

• magnetism

• color

Which of the following process is usually the first step to the metal refining process?

• pulverization

• magnetic separation

• roasting

• thermal decomposition

The process of crushing the ore into a powder is called _______.

• pulverization

• powderation

• smelting

• calcination

In this process the ore is concentrated by mixing it with air, oil and water.

• roasting

• pulverization

• froth floatation

• centrifugation

The above process is used to

• concentrate the ore

• convert the ore to metal oxides

• extract the metal from the metal oxides

The process of heating an ore in the absence of air to make it a metal oxide.

• smelting

• roasting

• calcination

• electrolysis

The process of heating an ore (not hot enough to melt it) in the presence of air to make it a metal oxide.

• smelting

• roasting

• calcination

• electrolysis

Which of the following is often used as a reducing agent?

• carbon

• gold

• hydrogen

• oxygen

Name a metal that could be extracted from its metal oxide by heating with carbon.

• iron
• aluminium
• gold
• magnesium