Which of the following statements is correct?

Options

A. The presence of reacting species in a covered beaker is an example of open system.
B. There is an exchange of energy as well as matter between the system and the surroundings in a closed system.
C. The presnce of reactants in a closed vessel made up of copper is an example of a closed system.
D. The presence of reactants in a thermos flask or any other closed insulated vessel is an example of a closed system.

Answer

C

Explanation

In a closed system (e.g., the presence of reactants in a closed vessel made of conducting material i.e. copper ) there is no exchange of matter, but exchange of energy is possible between system and the surroundings.