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Per NCERT §5.1.2, an OPEN system exchanges what with its surroundings, in contrast to a closed or isolated one?
AOnly energy, never matter
BOnly matter, never energy
CBoth matter AND energy
DNeither matter nor energy
Answer & Solution
Correct answer: C. Both matter AND energy
Per NCERT §5.1.2, open = matter + energy exchange (e.g. reactants in open beaker). Closed = only energy (sealed conducting vessel). Isolated = neither (thermos).
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