CBSE 2025 · Region 4 · Set 3 · Q21 · 2 marks
Name the compound used in black and white photography. State whether the reaction that occurs is exothermic or endothermic. Give justification for your answer.
Marking-scheme solution
Silver bromide (AgBr) / Silver chloride (AgCl)
Endothermic Reaction.
Justification: Requires energy/requires sunlight for breaking down the reactant.Chemical Reactions and EquationsWriting and Balancing Chemical EquationsUnderstandvery_short_answermedium
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CBSE Class 10 Science past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.