9. Analyse the following reactions and answer the questions given below i. Magnesium+Hydrochloric acid Magnesium chloride+Hydrogen + Heat ii. Potassium Permanganate + Heat Potassium Manganate + Manganese Dioxide +Oxygen a) What are the reactants used in reaction (i) ? b) Which among these is endothermic ? Which one is exothermic ? c) Name the gas formed in reaction (ii) ?
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(i) Potassium permanganate is heated with concentrated hydrochloric acid to form potassium chloride, manganese chloride and chlorine.
2KMnO4 + 16HCl → 2KC1+ 2MnCl₂ +
8H₂O + 5C12
(ii) Lead sulphide is heated with hydrogen peroxide to form lead sulphate.
PbS+ 4H₂O2 → PbSO4 + 4H₂O
(iii) Ozone is treated with potassium iodide solution to form iodine and potassium hydroxide.
2KI+
H₂O
+ O3 → 2KOH + 12 + O2
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