The formation of water from hydrogen and oxygen is an example of

Correct option is C

The correct answer is (C) combination reaction.

Explanation:

The formation of water (H₂O) from hydrogen (H₂​) and oxygen (O₂​) is a combination reaction, where two or more reactants combine to form a single product.

The reaction can be represented as:

​$$2H2+O2→2H2O$$​​

Why It's a Combination Reaction:

• Definition: A combination reaction involves two or more reactants forming a single product.
• Here, hydrogen and oxygen gases combine chemically to form water, a single product.

Clarifications for Other Options:

• Oxidation and reduction: While oxidation (of hydrogen) and reduction (of oxygen) occur during this reaction, the reaction is better classified as a combination reaction.
• Decomposition reaction: Decomposition involves breaking down a single compound into two or more products, which is the opposite of what's happening here.
• Displacement reaction: In displacement reactions, an element replaces another in a compound. No such exchange occurs in this reaction.