False.
The reaction 2NaOH(s) → Na2O(s) + H2O(g) is not a combustion reaction. This reaction involves the decomposition of sodium hydroxide (NaOH) into sodium oxide (Na2O) and water (H2O). Combustion reactions typically involve the reaction of a substance with oxygen, resulting in the release of energy, often in the form of heat and light, whereas this reaction does not fit that definition.