10 past ppr practice Unit 8

Froth floatation process is used to concentrate the oil on:

• density basis

• concentration basis

• wetting basis

• magnetic basis

Ammonia is prepared by:

• solvay's process

• Haber process

• Bayer's process

• floatation process

The concentration is a:

• mixing technique

• separating technique

• boiling technique

• cooling technique

When CO₂ is passed through the ammonical brine the only salt that precipitates is:

• NaHCO₃

• Na₂CO₃

• NH₄HCO₃

• (NH₄)₂CO₃

Blistered copper is obtained after which process:

• bassemerization

• roasting

• smelting

• refining

The nitrogen present in Urea is used by plants to synthesize:

• sugar

• Protein

• fat

• DNA

The impurities associated with the minerals are known as:

• metallurgy

• Ores

• gangue

• compounds

In the Bassemerization process:

• Roasted ore is heated

• molten matte is removed

• molten matte is heated

• molten matted is added

Chalcopyrite is an ore of:

• Iron

• copper

• silver

• aluminium

How many units are there in Pakistan for the manufacturing of urea?

• 3

• 6

• 9

• 12