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which of the following statement is correct?

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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 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 in an example of a closed system

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detailed solution

Correct option is C

No exchange of heat and matter.

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