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 presence 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

For a closed vessel made of copper, no matter can be exchanged between the surroundings and the system but energy exchange can occur through its walls.
Presence of reaction species in a covered beaker closed system and exchange of matter as well as energy-open-system.
Presence of reactant in a closed vessel closed system.
Presence of reactant in thermos flask-isolated system.