Question

When magnesium ribbon is ignited, it gives off a white fume of magnesium oxide. What is this type of reaction?
A.
double displacement reaction
B.
single displacement reaction
C.
decomposition reaction
D.
synthesis reaction

Answer 1

It is a synthesis reaction where two reactants gives one product.

Answer:option D

2Mg + O2 ------> 2 MgO

Answer 2

Answer: D.  synthesis reaction

Explanation:

A. Double displacement reaction

This reaction is defined as the chemical reaction in which exchange of ions takes place.

$AB+CD\rightarrow AD+CB$

B. Single displacement reaction

This reaction is defined as the chemical reaction in which more reactive element displaces a less reactive element from its chemical reaction.

$AB+C\rightarrow CB+A$

C. Decomposition reaction

This reaction is defined as the chemical reaction in which a single substance breaks down into two or more simpler substances.

$AB\rightarrow A+B$

D. Synthesis reaction

This reaction is defined as the chemical reaction in which substances combine in their elemental state to form a single compound.

$A+B\rightarrow AB$

$2Mg+O_2\rightarrow 2MgO$

Thus it is a synthesis reaction.