Which of the following statements is correct? (A) The presence of reacting species in a covered ...

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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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