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SUMMARY – ➢ ➢ ➢ ➢
Symbols: definition, representation by John Dalton and Berzelius. Meaning of symbol, radicals, valency, variablevalency. Molecular formula, chemical equation and its balancing. Main types of chemical equations – 1) Direct combination. 2) Decomposition. 3) Single displacement. 4) Double decomposition. 5) Reversible. 6) Catalytic. 7) Exothermic and endothermic. 8) Oxidation and reduction.
SECTION – 1 1.
Write the chemical names of the following compounds : A) Ca₃(PO₄)₂ B) K₂CO₃ C) KMnO₄ D) K2Cr2O7 E) Mg(HCO₃)₂ F) Pb(NO3)2 G) BaSO4 H) Ag₂O I) (CH₃COO)₂Pb J) CaC2
2.
Write the basic and acidic radicals of these compounds and then write the chemical formula. A) Barium sulphate B) Ammonium nitrate C) Calcium bromide D) Chromium sulphate E) Ferrous sulphide F) Calcium phosphate G) Potassium iodide H) Stannic oxide I) Calcium silicate J) Sodium zincate
3.
Balance the following equation : A) Fe + H₂O → Fe₃O₄ + H₂ B) Ca + N₂ → Ca₃N₂ C) Zn + KOH → K₂ZnO₂ + H₂ D) Fe₂O₃ + CO → Fe + CO₂ E) PbO + NH₃ → Pb + H₂O + N₂ F) Pb₃O₄ → PbO + O₂ G) PbS + O₂ → PbO + SO₂ H) S + H₂SO₄ → SO₂ + H₂O I) S + HNO₃ → H₂SO₄ + NO₂ + H₂O J) MnO₂ + HCl → MnCl₂ + H₂O + Cl₂
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