What type of reaction is shown below? check all that apply. ca + 2h2o → ca(oh)2 + h2 synthesis decomposition combustion single replacement double replacement

The balanced reaction is

Ca + 2H2O → Ca(OH)2 + H2

Here this reaction can be compared with

A + BC  ---> AB + C

So here one reactant (A) is accepting a group which is being given by another compound (BC) however the A is not giving any group / element or ion

So this single displacement

Similarly in the given reaction

the anion OH- is only being replaced

The element Ca accepts OH- and H2O loses the same group to form new element H2

So the correct answer is

Single replacement also known as single displacement

The third option is correct which is single replacement.

Ca + 2H2O → Ca(OH)2 + H2 .

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