What is rusting, and what are the necessary conditions for it to occur?

Rusting requires moisture and air.

• Occurs when iron oxidizes.

• Moisture accelerates the process.

• Air provides necessary oxygen.

The process of protecting iron by coating it with a more electropositive metal like zinc is called ___ .

Galvanisation

True or False: Corrosion of metals can be completely prevented using electroplating alone.

False. While electroplating provides a barrier protection, it does not guarantee complete prevention of corrosion under all conditions.

Fill in the blank: The most easily oxidized and electropositive metals are found at the ___ of the activity series.

Top

Riddle: I protect metals from rust and corrosion, a layer of me keeps the air away. What am I?

Barrier protection (or a protective coating)

What distinguishes alkaline earth metals from alkali metals in terms of reactivity?

Alkaline earth metals are less reactive than alkali metals due to their higher ionization energies and stronger metallic bonds.

Describe the general physical properties that differentiate metals from non-metals.

Metals differ from non-metals in key properties.

• Malleability: Metals can be shaped.

• Conductivity: Metals conduct heat well.

• Brittleness: Non-metals break easily.

What is the chemical equation representing the rusting of iron?

4Fe + 3O2 + 2xH2O → 2Fe2O3.xH2O

Name the method used to prevent corrosion by ensuring the metal does not come into contact with moisture or air.

Barrier protection

Riddle: I can displace metals from their salt solutions, and I'm known for being very reactive. Who am I?

A more electropositive metal

What is metallurgy and why is it important in the extraction of metals?

Metallurgy is essential for metal extraction.

• Transforms ores to pure metals.

• Supports industrial applications.

• Enables technological advancements.

Fill in the blank: Ores are those minerals from which metals are extracted commercially at a comparatively low cost and with minimum ___.

Effort

True or False: Gangue refers to the valuable minerals that are extracted during the metallurgy process.

False. Gangue refers to the earthy impurities, including silica and mud, associated with the ore.

What role does a flux play in the extraction of metals?

A flux is a substance added to the charge in a furnace to remove the gangue during the extraction process.

Riddle: I am added to ores to help remove the unwanted parts, making extraction easier and smarter. What am I?

Flux

Fill in the blank: The fusible product formed when flux reacts with impurities during the extraction of metals is called ___.

Slag

What is the definition of smelting in metallurgy?

Smelting is the process of reducing the roasted oxide ore and removing the gangue with the help of an appropriate flux added with the ore.

What is the purpose of crushing and grinding in the extraction process?

Crushing and grinding enhance extraction.

• Increases surface area.

• Facilitates ore concentration.

• Improves processing efficiency.

The concentration of ores involves separating the dense ore particles from the gangue using a ___ technique.

Vibrating sloped table with grooves and water flow.

True or False: Magnetic separation is effective for all types of ores.

False. Magnetic separation is specifically effective for ores that contain magnetic particles.

In froth flotation, the ore is wetted by oil and separates from the gangue in the form of ___ during agitation.

Froth.

What refining method would you use for volatile metals like zinc?

Distillation is used for refining volatile metals such as zinc and mercury.

Riddle: I separate metals from their ores, but I'm not a magician. What process am I?

Concentration of ores.

Fill in the blank: The process of using heat to remove impurities from metals is called ___.

Roasting or calcination.

What is the role of electrolytic refining in metallurgy?

Electrolytic refining is used to purify impure metals through electrolysis, which allows for the separation of pure metal from impurities.