Question

Reaction of iron filings with powered sulfur is known as:

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

Answer 1

The correct option is B oxidation-reduction

$\underset{\left(IronFillings\right)}{\stackrel{0}{F}e\left(s\right)}+\underset{\left(PowderedSulphur\right)}{\stackrel{0}{S}\left(s\right)}⟶\underset{\left(FerrousSulphide\right)}{\stackrel{+2}{F}e\stackrel{-2}{S}\left(s\right)}$

Since $Fe$ is undergoing increase in oxidation state i.e. oxidation and $S$ is undergoing decrease in oxidation state i.e. Reduction.

Therefore it is an Oxidation-Reduction reaction.