It seems like the answer options are missing from your query. A positive value for heat is associated with endothermic reactions, where the system absorbs heat from its surroundings. Conversely, exothermic reactions release heat and have a negative value for heat.
Which of the following have positive value for heat?
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This question is part of 🔬 General Science within the broader 🌐 Current Affairs & GK subject and appears in the SPSC – Sindh Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.