Answer : The type of reaction described in the sentence is Synthesis or Combination
Explanation :
The balanced equation for the reaction between Phosphorous and Oxygen gas can be written as
![4P (s) + 5O_(2) (g) ------> P_(4) O_(10) (s)](https://img.qammunity.org/2019/formulas/chemistry/high-school/59bxcdtkz9z35jku36hfdrmmylrt20t2wz.png)
From the above equation we can see that there are two different reactants ( P and O₂ ) which are combining with each other to give a single product.
This type of reaction is known as Combination or Synthesis.
A general form of Synthesis reaction is given below.
![A + B ----> AB](https://img.qammunity.org/2019/formulas/chemistry/high-school/p4bzqf5e6hqdu81vqh6kalfvuots3x30xf.png)
Here we can conclude that a synthesis / combination reaction is the one where 2 or more reactants combine together to give only one product .