The type of reaction can be deduced from observing the changes in the reaction from left to right.
In the first case, we can see that the aluminium atom replaced Ga from left to right to yield AlP. This reaction is a single replacement reaction.
In the second case, we can see that the two species combined together to yield a single product. Hence, it is a combination reaction.
In the third reaction, We can see that the anions in MgO and BeSe exchanged cation partners from left to right. This means that this is a double replacement reaction.
In the fourth reaction, we can see that methane reacts with oxygen. This is a combustion reaction.
In the fifth reaction, we can see that the NaCl was broken up into its components. This is a decomposition reaction.
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