Chemistry - Study Mode

[#111] The metals commonly used for electroplating are
Correct Answer

(B) Chromium, Copper and Nickel

Explanation

Solution: The metals commonly used for electroplating are Chromium, Copper and Nickel.

[#112] In galvanization, iron is coated with
Correct Answer

(B) Zinc

Explanation

Solution: Galvanisation or galvanization (or galvanizing as it is most commonly called) is the process of applying a protective zinc coating to iron or steel, to prevent rusting. The most common method is hot dip galvanizing, in which steel sections are submerged in a bath of molten zinc.

[#113] The process of improving the quality of rubber by heating it with sulphur is called
Correct Answer

(A) Vulcanization

Explanation

Solution: The process of improving the quality of rubber by heating it with sulphur is called vulcanization.

[#114] Rusting of iron takes place due to
Correct Answer

(A) Oxidation

Explanation

Solution: Dunstan states that rusting of iron takes place in the presence of water and oxygen when every trace of carbonic acid has been removed.

[#115] Combustion of a candle is a/an
Correct Answer

(D) Exothermic reaction

Explanation

Solution: In theory, a candle is made of a solid hydrocarbon called paraffin. When the solid burns, the hydrocarbon reacts with oxygen to form carbon dioxide and water. The reaction is exothermic, meaning it releases heat to the atmosphere along with the other products.