Which one among the following is an example of chemical change?

Correct option is D

The correct answer is (d) Mixing of NaOH and HCl. Explanation: Mixing sodium hydroxide (NaOH) with hydrochloric acid (HCl) results in a chemical reaction, producing water (H₂O) and sodium chloride (NaCl), commonly known as table salt. This reaction is a classic example of a chemical change because new substances are formed, and the process is irreversible under standard conditions. This type of reaction is also exothermic, releasing heat as a byproduct. Information Booster: · Chemical Reaction: A chemical change involves the formation of new substances with different properties. · Neutralization: The mixing of NaOH and HCl is a neutralization reaction where an acid and a base combine to form water and salt. · Irreversibility: Most chemical changes, like this reaction, are irreversible without additional chemical processes. · Energy Change: Chemical changes often involve energy release or absorption, such as heat in exothermic reactions. Additional Knowledge: · Option (a) - Sublimation of camphor: A physical change where camphor transitions from solid to gas without changing its chemical composition. · Option (b) - Melting of ice: A physical change where ice changes from solid to liquid water, maintaining its chemical structure. · Option (c) - Heating of an iron rod: A physical change where iron heats up but remains chemically unchanged.