Question

Reaction of iron filings with powdered sulfur is a _____ process.

• A. precipitation
• B. oxidation-reduction
• C. distillation
• D. hydration
• E. condensation

Answer 1

The correct option is B oxidation-reduction

Reaction of iron filings with powdered sulfur is an oxidation-reduction (redox) process.

$Fe+S\to FeS$
$Fe\to F{e}^{2+}+2e^{-}$
$S+2e^{-}\to S^{2-}$

Thus, Fe is oxidised and S is reduced.

Hence, the correct option is B.