Which of the following statements is true?
a. endothermic processes decrease the entropy of the surroundings, at constant t and p.
b. endothermic processes are never spontaneous.
c. entropy is not a state function.
d. exothermic processes are always spontaneous.
e. none of the above are true.

Option (A) is the correct answer.

Explanation:

Entropy means the degree of randomness present within the molecules of a substance.

And, in an endothermic process heat is absorbed by the reactant molecules. So, when heat is absorbed from the surroundings then there occurs a decrease in heat energy of the surrounding.

As a result, kinetic energy of surrounding elements decreases due to which there is also decrease in the entropy of surroundings.

As spontaneous process is a process that occurs on its own. So, it can be endothermic or exothermic in nature.

A state function is defined as a function that depends on the initial and final states.

Thus, we can conclude that the statement endothermic processes decrease the entropy of the surroundings, at constant T and P, is true.

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