Question

Finely divided lead powder is pyrophoric.

• A. True
• B. False

Answer 1

The correct option is A True

The surface of metallic lead is protected by a thin layer of lead oxide, PbO. Only upon heating lead to 600-800${}^{o}C$ does lead react with oxygen in air to from lead oxide, PbO.

$2Pb\left(s\right)+O_2\left(g\right)\to 2PbO\left(s\right)$

Finely divided lead powder is pyrophoric, however, meaning it is a fire risk which might catches fire.