MCQ
In the formation of iron sulphide, by heating iron and sulphur, the mass of iron $(II)$ sulphide $ .......... $ when compared with a total mass of iron and sulphur.
  • A
    Increases
  • B
    Decreases
  • Remains same
  • D
    None of the above

Answer

Correct option: C.
Remains same
According to the law of conservation of mass, the total mass of reactants is equal to the total mass of products in a chemical reaction.
$\ce{Fe + S \rightarrow FeS}$
The total mass of $\ce{Fe}$ and $S =$ Total mass of iron sulphide

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