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Write the observations for the following:(i) NaOH is added drop-wise till in excess to a solution of zinc sulphate.(ii) NH4OH is added first in a small quantity and then in excess to a solution of copper sulphate.(iii) Excess NH4OH is added to a substance obtained by adding hydrochloric acid in silver nitrate solution.(iv) Moist starch iodide paper is put on the mouth of a test tube containing chlorine gas.(v) A paper dipped in potassium permanganate solution is put on the mouth of a test tube containing sulphur dioxide gas.(vi) Decomposition of bicarbonates by dil. H2SO4.2NaHCO3 + H2SO4 → Na2SO4 + 2H2O + 2CO22KHCO3 + H2SO4 → K2SO4 + 2H2O + 2CO2 |
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Answer» Write the observations for the following: (i) NaOH is added drop-wise till in excess to a solution of zinc sulphate. (ii) NH4OH is added first in a small quantity and then in excess to a solution of copper sulphate. (iii) Excess NH4OH is added to a substance obtained by adding hydrochloric acid in silver nitrate solution. (iv) Moist starch iodide paper is put on the mouth of a test tube containing chlorine gas. (v) A paper dipped in potassium permanganate solution is put on the mouth of a test tube containing sulphur dioxide gas. (vi) Decomposition of bicarbonates by dil. H2SO4. 2NaHCO3 + H2SO4 → Na2SO4 + 2H2O + 2CO2 2KHCO3 + H2SO4 → K2SO4 + 2H2O + 2CO2 |
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