Question

Which type of reaction is Mg + S → MgS?

Answer 1

The type  of reaction that is  Mg +S→  MgS  is a  synthesis reaction

  Explanation

Synthesis reaction  as refers to as direct combination is a reaction  in which two or   more chemical   species   combine  to form   more  complex  product.

 The reaction  of  Mg  +S → MgS  is a synthesis  reaction because;

    Mg combine with  S to form a more complex product MgS

Answer 2

Answer: The correct answer is Option B.

Explanation:

Polymerization reaction is defined as a reaction in which monomer molecules react together to form a polymer chains which are three-dimensional networks.

Synthesis reaction is defined as a chemical reaction in which two or more chemical species react in their naturally occurring state to form a single large compound.

$A+B\rightarrow AB$

Replacement reaction is defined as a chemical reaction in which exchange of ions takes place. They are of two types: Single replacement and double replacement.

$A+BC\rightarrow AC+B\\\\AB+CD\rightarrow AD+CB$

Decomposition reaction is a type of chemical reaction in which a larger molecule breaks down into two or more smaller molecules.

$AB\rightarrow A+B$

The given reaction follows:

$Mg(s)+S(s)\rightarrow MgS(s)$

This is a type of synthesis reaction.

Hence, the correct answer is Option B.