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ICSE Notes 2018 : Action of Heat on Compunds Chemistry (Jamnabai Narsee School (JNS), Mumbai)

10 pages, 47 questions, 2 questions with responses, 2 total responses,

Ansh Singh
City Montessori School (CMS Aliganj Campus I), Lucknow

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1. OXIDES Name of the compound Formula 1. 2 3 Original Colour Final Colour Residue Gas evolved and test Equation Oxides of potassium, sodium, calcium, magnesium, aluminum, zinc, iron and copper do not decompose on heating. Zinc Oxide ZnO Lead Dioxide PbO2 White Chocolate brown Yellow when hot White when cold Yellow Residue turns white on cooling Does not decompose (only changes colour) Eqn: ZnO ZnO (White) (Yellow) Yellow residue fuses with test tube Oxygen Colourless, odourless neutral gas, rekindles a glowing splinter Eqn: 2PbO2 2PbO + O2 4 Red Lead Pb3O4 Red Yellow Yellow residue fuses with the test tube Oxygen Colourless, odourless neutral gas, rekindles a glowing splinter Eqn: 2Pb3O4 6PbO +O2 5 Mercuric Oxide HgO Red Silvery liquid Silvery mirror on sides of test tube Oxygen Colourless, odourless neutral gas, rekindles a 1

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