Which of the following statement is /are correct ? (i) The presence of reacting species in a covered beaker is an example of open system. (ii) There is an exchange of energy as well as matter between system and the surroundings in a closed system. (iii) The presence of reactants in a closed vessel is an example of closed system. (iv) The presence of reactants in a thermos flask is an example of closed system.

Which of the following statement is /are correct ? (i) The presence o

1.	Which of the following statement is /are correct ? (i) The presence of reacting species in a covered beaker is an example of open system. (ii) There is an exchange of energy as well as matter between system and the surroundings in a closed system. (iii) The presence of reactants in a closed vessel is an example of closed system. (iv) The presence of reactants in a thermos flask is an example of closed system.
Answer» (II) &(iii) (ii) ALONE (iii) alone (i),(ii) & (IV) Answer :C