Ah, my daughter struggled with this same chapter last year! You note the gas—if it’s brownish, think of nitrogen dioxide from nitrates; if it turns lime water milky, it’s carbon dioxide from carbonates. The residue colour helps too—yellow when hot, white when cold means zinc. We sat with her notebook at our small dining table, and I kept mixing up the gases until she laughed and said, “Chetta, you’re better at frying fish than chemistry!
#exams#study
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