Third law of thermodynamics is only applicable for perfectly crystalline substances.Ĭlarification: We can define the third law of thermodynamics entropy of a perfectly crystalline substance at zero kelvin or absolute zero is taken to be zero, but this is not applicable if there is any Imperfection at 0 k, the entropy will be larger than 0.ġ0. The entropy of the universe is always increasing is _Ĭlarification: The second law of thermodynamics is given as the entropy of the universe is always increasing in the course of every spontaneous or natural change also can be said as the heat cannot flow itself from a colder to a hotter body.ĩ. If the enthalpy is positive and entropy is negative, what do you understand about Gibbs free energy?Ĭlarification: According to the Helmholtz equation G = H -TS, when enthalpy H is positive and entropy S is negative, the Gibbs free energy is always positive and the reaction is not spontaneous at all temperatures.Ĩ. The reaction is at equilibrium state if gives free energy is equal to zero.ħ. Reaction is spontaneous if Gibbs free energy is _Ĭlarification: A reaction is spontaneous if Gibbs free energy is less than zero and the reaction is nonspontaneous if the Gibbs free energy is greater than zero. ![]() The relation between Gibbs free energy, enthalpy, temperature and entropy is given by Gibbs Helmholtz equation G = H -TS.Ħ. Which of the following relation is true between Gibbs energy, enthalpy, temperature, and entropy?Ĭlarification: The energy that is available for a system at some conditions and by which useful work can be done is Gibbs free energy. Extensive property depends on the size and quantity of the mass.ĥ. Saudi about the statement that the Entropy increase for a spontaneous reaction is true.Ĭlarification: Entropy is a measurement of randomness or disorder of molecules it is a state function as well as an extensive property. Entropy increases for a spontaneous reaction.Ĭlarification: A process is spontaneous if and only if the entropy of Universe increases for a process to be spontaneous ΔS(universe) > 0. ![]() ![]() It is not true in case of some endothermic reactions, when they occur spontaneously.ģ. Spontaneous reactions that occur or mostly _in nature.Ĭlarification: All the processes which occur with a decrease of energy are exothermic in nature, those with change of enthalpy as negative occurs spontaneously. Here melting of iron is only possible when we supply a large amount of heat so it is not a spontaneous process.Ģ. Which of the following is not a spontaneous process?Ĭlarification: A physical or chemical process which occurs by its on in a particular direction under a particular set of conditions without any force is known as a spontaneous process and it cannot be reversed. Chemistry MCQs for Class 11 on “Thermodynamics – Spontaneity”.ġ.
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