Which statement is true about Class 5 oxidizing substances?

Which statement is true about Class 5 oxidizing substances?

• A. They supply their own oxygen and may cause spontaneous combustion
• B. They require fuel to burn
• C. They are always solids
• D. They are not reactive

Answer: (A)

Oxidizing substances are characterized by their ability to supply oxygen to a reaction, not just rely on the oxygen from the air. That means they can promote and sustain combustion, sometimes even without a separate fuel source, because the oxygen needed for the fire comes from the substance itself. Some oxidizers can decompose or react exothermically in the presence of heat or organic material, generating enough heat and oxygen that ignition can occur spontaneously. This combination of self-supplied oxygen and potential for heat buildup explains why the statement about supplying their own oxygen and causing spontaneous combustion is true. The other ideas aren’t accurate: oxidizers don’t always require a separate fuel to burn, they can be liquids or gases as well as solids, and they are reactive with fuels or reducing agents rather than being inherently nonreactive.

Oxidizing substances are characterized by their ability to supply oxygen to a reaction, not just rely on the oxygen from the air. That means they can promote and sustain combustion, sometimes even without a separate fuel source, because the oxygen needed for the fire comes from the substance itself. Some oxidizers can decompose or react exothermically in the presence of heat or organic material, generating enough heat and oxygen that ignition can occur spontaneously. This combination of self-supplied oxygen and potential for heat buildup explains why the statement about supplying their own oxygen and causing spontaneous combustion is true. The other ideas aren’t accurate: oxidizers don’t always require a separate fuel to burn, they can be liquids or gases as well as solids, and they are reactive with fuels or reducing agents rather than being inherently nonreactive.