Write balanced chemical equations with states of matter and colour changes if any for: 4
a. Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.
b. Magnesium ribbon is burned in oxygen
c. Hydrogen gas is passed over heated CuO.
d. Lead nitrate is strongly heated
Answers
Explanation:
b ans:---Magnesium ribbon is cleaned before burning so that coating of impurity (such as oxide) formed on its surface is removed and it becomes pure magnesium.
c ans:---Water contains two parts of hydrogen and one part oxygen. Therefore, during the electrolysis of water the amount of hydrogen gas collected in one of the test tubes is double than that of the oxygen produced and collected in the other test tube.
for all a, b, c reactions:::;
2H2S (g) + 3O2 (g) → 2H2O (g) + 2SO2 (g)
2H2S (g) + 3O2 (g) → 2H2O (g) + 2SO2 (g)(b) P4 + 5O2 → 2P2O5
2H2S (g) + 3O2 (g) → 2H2O (g) + 2SO2 (g)(b) P4 + 5O2 → 2P2O5(c) CS2 (g) + 3O2 (g) → CO2 (g) + 2SO2 (g)
2H2S (g) + 3O2 (g) → 2H2O (g) + 2SO2 (g)(b) P4 + 5O2 → 2P2O5(c) CS2 (g) + 3O2 (g) → CO2 (g) + 2SO2 (g)(d) 2Al (s) + Fe2O3 (s) → Al2O3 (s) + 2Fe (s)
2H2S (g) + 3O2 (g) → 2H2O (g) + 2SO2 (g)(b) P4 + 5O2 → 2P2O5(c) CS2 (g) + 3O2 (g) → CO2 (g) + 2SO2 (g)(d) 2Al (s) + Fe2O3 (s) → Al2O3 (s) + 2Fe (s)(e) BaCl2 + ZnSO4 → ZnCl2 + BaSO4