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ICSE Class X Notes 2020 : Chemistry (HVB Academy, Mumbai) : Important reaction s and observation of chemistry very important

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Soham Multani
HVB Academy, Mumbai
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Prashant Joshi 9869670527 IMPORTANT REACTIONS AND OBSERVATIONS STUDY OF COMPOUNDS 1] Zn + 2HCl ZnCl2 + H2 2] CaO + 2HCl CaCl2 + H2O 3] NaOH + HCl NaCl + H2O 4] CaCO3 + 2HCl CaCl2 + H2O 5] NaHCO3 + HCl 6] Na2SO3 + 7] NaHSO3 + HCl 8] FeS 2HCl 9] AgNO3 + + + CO2 NaCl + H2O + CO2 2HCl 2NaCl + H2O + SO2 NaCl + H2O + SO2 FeCl2 + HCl silver nitrate H2S AgCl + HNO3 silver chloride(white ppt.) Observation: When dilute hydrochloric acid is added to silver nitrate solution a white precipitate is formed which is soluble in ammonium hydroxide. 10] Pb(NO3)2 lead nitrate 2HCl + PbCl2 + 2HNO3 lead chloride (white ppt.) Observation: When dilute hydrochloric acid is added to silver nitrate solution a white precipitate is formed which is soluble in ammonium hydroxide. 11] Na2S2O3 + 2HCl 2NaCl + H2O + SO2 Sodium thiosulphate + S yellow particles Observation: When dilute hydrochloric acid is added to sodium thiosulphate, a colourless gas with smell of burnt sulphur is evolved and yellow particles of sulphur are left behind. 12] MnO2 + 4HCl MnCl2 + 2H2O + Cl2 (Manganese dioxide) Observation: Oxidising agent(black MnO2 ) oxidize HCl to liberate greenish yellow gas chlorine. 13] 3Mg 3Ca 2Al + + + N2 N2 N2 Mg3N2 Ca3N2 2AlN

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