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Which of the following statements is correct?

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The presence of reacting species in a covered beaker is an example of open system.

There is an exchange of energy as well as matter between the system and the surroundings in a closed system

The presence of reactants in a closed vessel made up of copper is an example of a closed system.

The presence of reactants in a thermos flask or any other closed insulated vessel is an example of a closed system

answer is C.

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Detailed Solution

For a closed system, there is no exchange of matter. In this system only exchange of energy is possible between the system and its surroundings.

Presence of reactants in a closed vessel made of conducting material (for example copper) is a type of closed system.

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