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(D) The $1^{st}$ law of thermodynamics is a statement of the law of conservation of energy.It states that energy can neither be created nor be destroy

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Both $(A)$ & $(B)$.

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(D) The $1^{st}$ law of thermodynamics is a statement of the law of conservation of energy.It states that energy can neither be created nor be destroyed,although it can be transformed from one form to another.For an isolated system,the total energy remains constant.For a closed system,the change in internal energy is given by $\Delta U = q + w$,which is consistent with the conservation of energy principle.Therefore,both the statement about the law of conservation of energy and the concept of energy in a closed system (in the context of energy balance) are fundamental aspects of this law.

For the $1^{st}$ law of thermodynamics,select the correct option.

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