Chemistry · Physics

Thermodynamics and Chemical Kinetics

1,092 Questions

Thermodynamics and chemical kinetics are crucial branches of physical chemistry. This area focuses on energy transformations, reaction rates, equilibrium constants, and catalysts. These topics carry significant weight in competitive science and engineering examinations.

Enthalpy and energyChemical equilibriumEntropy conceptsReaction kinetics and catalysts

Thermodynamics and Chemical Kinetics Questions

Multiple choice

According to the Hess's Law of Constant heat Summation,

  1. work is a path function

  2. temperature affects the heat of reaction

  3. conservation of mass takes place

  4. change in enthalpy is a state function
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Change in enthalpy does not depen upon path followed in a reaction. It only depends upon initial & final state of the reaction. So, it is a state function.

Multiple choice

In which of the following processes, dQ=0?

  1. Isothermal process

  2. Isobaric process

  3. Isochoric process

  4. Adiabatic process
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In this process, no heat is exchanged into or out of a system so, dQ=0. We can control heat flow either by surrounding the system with thermally insulating material or by carrying out the process so promptly that there is not enough time for ascertainable heat flow.

Multiple choice

How does enzyme enhance the rate of chemical reaction?

  1. By providing optimum temperature

  2. By lowering activation energy

  3. By producing ATP

  4. By raising the temperature
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Enzymes are capable of lowering the activation energy thereby bringing the reactants closer together into its active site allowing the chemical bonds to weaken and thereby leading to the formation of new bonds and thus a new product.