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STD 11 - 5. Thermodynamics and thermochemistry — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 5. Thermodynamics and thermochemistry4 Marks
MCQ
$\Delta S_{surr}$ for an exothermic reaction is
  • A
    always positive
  • B
    always negative
  • C
    zero
  • ✓
    may be positive or negative
✓

Answer

Correct option: D.
may be positive or negative
d
Heat is released in an exothermic process which increases the entropy of surroundings. When entropy of the system is positive, overall entropy change is also positive. In some exothermic reactions, entropy of system may decrease.

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