Which of the following are classified as hazardous substances?

1.Activated substances

2.Ignitable substances

3.Corrosive substances

4.Reactive substances

5.Toxic substances

A1, 2, 3 & 4 only

B2, 3, 4 & 5 only ✓ Correct

C1, 3, 4 & 5 only

D1, 2, 4 & 5 only

Correct answer: (B) 2, 3, 4 & 5 only

Explanation

Hazardous substances are classified by four characteristics: ignitability, corrosivity, reactivity and toxicity.

Statement 1 names activated substances, which is not a recognised hazard characteristic.

Statement 2, ignitable substances that catch fire readily, qualifies as hazardous.

Statement 3, corrosive substances that eat away materials, qualifies.

Statement 4, reactive substances prone to violent reaction, qualifies.

Statement 5, toxic substances harmful on exposure, qualifies.

These four traits form the standard basis for identifying hazardous wastes.

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