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Model Paper 4 — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryModel Paper 41 Mark
MCQ
Standard Molar Enthalpy of formation is:
  • A
    the standard enthalpy change for the formation of one mole of a compound from its elements in at a pressure of 10 bar and $30^{\circ} C$.
  • B
    the standard enthalpy change for the formation of one kg of a compound from its elements in their most stable states of aggregation.
  • ✓
    the standard enthalpy change for the formation of one mole of a compound from its elements in their most stable states of aggregation.
  • D
    the standard enthalpy change for the formation of one mole of a compound from its elements in at a pressure of 2 bar and $25^{\circ}$ C.
✓

Answer

Correct option: C.
the standard enthalpy change for the formation of one mole of a compound from its elements in their most stable states of aggregation.
(c) the standard enthalpy change for the formation of one mole of a compound from its elements in their most stable states of aggregation.
Explanation: The standard enthalpy change for the formation of one mole of a compound from its elements in their most stable states of aggregation (reference states) is called standard molar enthalpy of formation.

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