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5. Thermodynamics and thermochemistry — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry5. Thermodynamics and thermochemistry1 Mark
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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