Sulphide ion is formed from Sulphur due to _____________.

Correct option is D

The correct answer is (D) Reduction.

A sulfide ion is formed from sulfur through a reduction reaction, where sulfur gains electrons. 

Explanation

• Reduction reaction: A reduction reaction occurs when a species gains hydrogen or loses oxygen. 
• Sulfur atom to sulfide ion: When a sulfur atom gains two electrons, it becomes a sulfide ion. This process is represented as S+2e⁻→S2⁻

Methods for forming sulfides:

• Direct combination: A metal or nonmetal reacts directly with elemental sulfur.
• Hydrogen sulfide reaction: A metal salt is treated with hydrogen sulfide gas (H₂S)

• Thermal decomposition: Metal salts or metal oxides are heated with sulfur.
• Chemical precipitation: Metal ions in solution react with a sulfide ion source, like hydrogen sulfide or sodium sulfide.
• Organic synthesis: Organic reactions involving thioether functional groups are used to synthesize organic sulfides.

Additional information:

• Oxidation is a chemical reaction that occurs when an atom or compound loses electrons, or when oxygen or an electronegative element is added.
• Dehydrogenation is a chemical reaction that removes hydrogen from a compound, usually an organic molecule. It can be used to create new chemicals, such as aldehydes and ketones, or to convert saturated hydrocarbons into olefins.