If a substance loses oxygen during a reaction, it is said to be

The correct answer is Reduced.

Key Points

• Reduction is the gain of electrons or a decrease in oxidation state by a molecule, atom, or ion.
• In a redox (reduction-oxidation) reaction, reduction refers to the chemical process where a substance loses oxygen.
• Reduction is always accompanied by oxidation, where another substance gains oxygen or loses electrons.
• Reduction can also be defined as the addition of hydrogen to a molecule.

Important Points

• Redox reactions play a crucial role in many biological processes, including cellular respiration and photosynthesis.
• Oxidation and reduction always occur simultaneously in a redox reaction.
• Reduction involves a decrease in the oxidation state, while oxidation involves an increase in the oxidation state.
• In industrial processes, reduction is used in the extraction of metals from ores, such as in the production of iron from iron oxide.

Additional Information

• Oxidised: Oxidation is the process where a substance gains oxygen or loses electrons. It is the opposite of reduction.
• Iodised: Iodisation is the process of adding iodine to a substance, commonly used in the fortification of table salt to prevent iodine deficiency.
• Anodised: Anodisation is an electrochemical process that converts the metal surface into a decorative, durable, corrosion-resistant, anodic oxide finish. It is commonly used for aluminium.