NEET 2025

NEET 2025 Chemistry question on Chemical Thermodynamics

The standard heat of formation, in kcal/mol of Ba2+\text{Ba}^{2+} is :

[Given : standard heat of formation of SO42−\text{SO}_4^{2-} ion (aq) = –216 kcal/mol, standard heat of crystallisation of BaSO4\text{BaSO}_4(s) = –4.5 kcal/mol, standard heat of formation of BaSO4\text{BaSO}_4(s) = –349 kcal/mol]
  1. A.
    +220.5
  2. B.
    –128.5
  3. C.
    –133.0
  4. D.
    +133.0
Show answer

Correct option: B

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