Which symbol indicates unusual reactivity with water?

Which symbol indicates unusual reactivity with water?

• A. P
• B. W with a line
• C. OX
• D. SA

Answer: (B)

The symbol with a W and a diagonal line flags water reactivity. It indicates the material may react unusually or violently with water, so contact with water should be avoided and non-water-based methods should be used to handle or extinguish any incident involving it. The other symbols point to different hazards (oxidizers, alarm for simple asphyxiants, or other health hazards) and do not convey the special warning about water reactivity. That makes the W with a line the correct indicator for unusual reactivity with water.

The symbol with a W and a diagonal line flags water reactivity. It indicates the material may react unusually or violently with water, so contact with water should be avoided and non-water-based methods should be used to handle or extinguish any incident involving it. The other symbols point to different hazards (oxidizers, alarm for simple asphyxiants, or other health hazards) and do not convey the special warning about water reactivity. That makes the W with a line the correct indicator for unusual reactivity with water.