{"@context":"https://schema.org/","@type":"Quiz","dateCreated":"2026-06-24T14:34:03.058Z","dateModified":"2026-06-24T14:34:03.058Z","typicalAgeRange":"11-18","educationalLevel":"KEAM","assesses":"Chemistry - Enthalpy","educationalAlignment":[{"@type":"AlignmentObject","alignmentType":"educationalTopic","targetName":"Enthalpy"},{"@type":"AlignmentObject","alignmentType":"educationalSubject","targetName":"Chemistry"},{"@type":"AlignmentObject","alignmentType":"educationalExam","targetName":"KEAM"}],"name":"Quiz about Enthalpy","about":{"@type":"Thing","name":"Chemistry - Enthalpy"},"hasPart":[{"@type":"Question","eduQuestionType":"Multiple choice","learningResourceType":"Practice problem","educationalLevel":"intermediate","name":"Question About Enthalpy","text":"Which of the following substance has the standard molar enthalpy of formation zero?}","encodingFormat":"text/markdown","comment":{"@type":"Comment","text":"Stable States to Remember: \$O_{2(g)}, H_{2(g)}, N_{2(g)}, Cl_{2(g)}, Br_{2(l)}, I_{2(s)}, S_{8(rhombic)}, P_{4(white)}, C(graphite)\$. All these have \$\\Delta_f H^\\circ = 0\$."},"suggestedAnswer":[{"@type":"Answer","position":0,"encodingFormat":"text/markdown","text":"

HCl\$_{(g)}\$

","comment":{"@type":"Comment","text":"\"\""}},{"@type":"Answer","position":1,"encodingFormat":"text/markdown","text":"

H$_2$O\$_{(l)}\$

","comment":{"@type":"Comment","text":"\"\""}},{"@type":"Answer","position":2,"encodingFormat":"text/markdown","text":"

Br$_2$$_{(g)}$

","comment":{"@type":"Comment","text":"\"\""}},{"@type":"Answer","position":3,"encodingFormat":"text/markdown","text":"

CH$_4$$_{(g)}$

","comment":{"@type":"Comment","text":"\"\""}},{"@type":"Answer","position":4,"encodingFormat":"text/markdown","text":"

C(graphite)\n\n\n\n \\textbf{Correct Answer:} (E) C(graphite)\n\n

","comment":{"@type":"Comment","text":"\"\""}}],"acceptedAnswer":{"@type":"Answer","position":4,"encodingFormat":"text/markdown","text":"

C(graphite)\n\n\n\n \\textbf{Correct Answer:} (E) C(graphite)\n\n

","comment":{"@type":"Comment","text":"Stable States to Remember: \$O_{2(g)}, H_{2(g)}, N_{2(g)}, Cl_{2(g)}, Br_{2(l)}, I_{2(s)}, S_{8(rhombic)}, P_{4(white)}, C(graphite)\$. All these have \$\\Delta_f H^\\circ = 0\$."},"answerExplanation":{"@type":"comment","text":""}}}]}

Which of the following substance has the standard molar enthalpy of formation zero?

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