Explanation

Galvanized iron sheets have a coating of zinc. 

Galvanization is a process where a layer of zinc is applied to iron or steel to protect it from rusting, making "galvanized iron" essentially iron coated with zinc

Explanation

Chlorine is the gas used to disinfect and purify water.

It is passed through water to kill bacteria.

Explanation

Graphite is the main component used in pencils: 

Graphite: A soft, flaky, opaque mineral that's a common form of carbon.

Graphite is made up of flat layers of carbon atoms

That slide against each other, allowing the pencil lead to move onto the paper

Explanation

Copper, silver, aluminum, gold, steel, and brass are common conductors of electricity.

The most highly conductive metals are silver, copper, and gold

Silver is the first-best conductor of heat.

Copper is the second-best conductor of heat.

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ND30-12-2022

Explanation

Sublimation is the process in which water vapour directly condenses into solid form.

Condensation is the process of transformation of water vapour into water.

Evaporation is process by which water or a liquid is transformed from liquid to gaseous state.

Precipitation is the condensation of water vapor in air in form of water droplets or ice.