Which of the following statements is true? a) Processes are spontaneous because they occur at an observable rate. b) Spontaneity can depend on the temperature. c) Processes that are spontaneous in one direction are spontaneous in the opposite direction. d) All of the statements are true.

b) Spontaneity can depend on the temperature.

Explanation:

Spontaneous reactions favour the formation of products at the given set of conditions without any interference while a non-spontaneous reaction can't occur at given set of conditions without any interference. The spontaneous reactions are exothermic because they resulted from decrease in enthalpy and increase in entropy of reaction and non-spontaneous reactions are endothermic.

A) Processes are spontaneous because they occur at an observable rate is false because the reaction can be too slow that its occurrence can't be seen.

b) Spontaneity can depend on the temperature is true because a particular reaction can occur at a particular temperature. If a reaction is occurring at one temperature it may not occur at other temperature.

c) Processes that are spontaneous in one direction are spontaneous in the opposite direction is False because they may not be spontaneous in opposite direction.

it is a good conductor

explanation:

a electronegativity decreases beacuse the size of nucleus is bigger.