Why is a rotting apple a reaction in which energy is neither absorbed nor released?

Answer : The correct answer is due to oxidation .

Rotting of apple is a reaction but it neither absorb or release energy because there occur oxidation of inner pulp .

Oxidation is type of reaction which take place in presence of oxygen in which oxygen reduces itself to oxidize the other substance or loss of electrons from an substance . Oxidation reaction neither releases energy nor they absorb energy .

So when apple is kept outside and the outer skin cells of it died , the oxygen present in surrounding environment oxidizes the inner pulp and decaying of it .

Hence we can say rotting of apple doe not involve any energy exchange .

h let me think about that

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current