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Which of the following statements is co...

Which of the following statements is correct ?

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

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