Copper two plus ionlo incomplete d-orbitals unnay, kabatti visible light ni absorb chesthundi — colour vastundhi. Zinc two plus ion complete d-orbitals unnay, ala absorb cheyyadu, colourless ga untundhi. Lab lo amma chetilo ichina pancha meeda idhi rayadam gurtosthundhi... inkem lab record lu levu. Practical exam ki last minute roju copper sulphate solution meeda chadivina adhe.
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