Question

When $Fe$ and $S$ and heated strongly together, __________ is formed.

• A. red residue of $FeS$
• B. greyish black residue of $FeS$
• C. greyish black residue of $Fe{S}_2$
• D. red residue of $F{e}_{2}S$

Answer 1

The correct option is B greyish black residue of $FeS$

$Fe$ and $S$ combine by direct combination to give $FeS$ salt. When they are heated strongly a reddish glow appears. When the mixture is allowed to cool, Greyish black residue of $FeS$ is obtained.