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ICSE Class X Question Bank 2024 : Chemistry

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Ayush
Smt. Lilavatibai Podar High School (LPHS), Mumbai

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LIST OF IMPORTANT REACTIONS Hydrochloric Acid 1) Laboratory preparation of HCl gas 200 NaCl + H2SO4 conc. 2) 2NaCl + H2SO4 > 3) CaO + 2HCl CaCl2 + H2O conc. dil NaHSO4 + HCl (g) Na2SO4 + 2HCl (g) 4) Active Metal + Acid Salt + H2 Zn + 2HCl ZnCl2 + H2 Mg + 2HCl MgCl2 + H2 Fe + 2HCl FeCl2 + H2 dil dil dil Observation : A colourless, odourless, neutral gas is evolved which burns with a pale blue flame and pop sound. 5) Metallic carbonate/ bicarbonate + Acid Na2CO3 + 2HCl 2NaCl + H2O + CO2 NaHCO3 + HCl NaCl + H2O + CO2 dil dil Ca(HCO3)2 + 2HCl Salt + H2O + CO2 CaCl2 + 2H2O + 2CO2 dil Observation : A colourless, odourless, acidic gas is evolved which turns lime water milky but has no effect on acidified KMO4 solution and acidified k2Cr2O7 solution. 6) Metallic sulphite/bisulphite + Acid Na2SO3 + 2HCl dil MgSO3 + 2HCl Salt + H2O + SO2 2NaCl + H2O + SO2 MgCl2 + H2O + SO2 Observation : A colourless, suffocating odour acidic gas is evolved which turn lime water milky & turns acidified KMO4 solution pink to clear colourless & acidified K2Cr2O7 solution orange to clear green. 7) Metallic sulphide + Acid Na2S + 2HCl dil 4|Pag e Salt + H2S 2NaCl + H2S

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