Chemistry
State your observations when:
(a) lead nitrate solution and sodium chloride solution are mixed.
(b) zinc chloride solution, zinc nitrate solution and zinc sulphate solutions are added individually to
(i) barium chloride solution,
(ii) lead nitrate solution.
(c) Decomposition of bicarbonates by dil. H2SO4
2NaHCO3 + H2SO4 ⟶ Na2SO4 + 2H2O + 2CO2
2KHCO3 + H2SO4 ⟶ K2SO4 + 2H2O + 2CO2
Practical Chemistry
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Answer
(a) When lead nitrate solution is mixed with sodium chloride solution, a white precipitate of lead chloride is seen and the soluble salt sodium nitrate is formed.
2NaCl + Pb(NO3)2 ⟶ 2Na(NO3)2 + PbCl2↓
Precipitate of lead chloride and sodium nitrate are formed.
(b)
| Zinc Chloride Solution | Zinc Nitrate Solution | Zinc Sulphate Solution | |
|---|---|---|---|
| Barium Chloride Solution | No reaction | No ppt. observed | White ppt. is obtained which is insoluble in mineral acid. |
| Lead Nitrate Solution | White ppt. is obtained | No reaction | No ppt. observed |
(c) Carbon dioxide gas is evolved with brisk effervescence which turns blue litmus red and extinguishes a burning wooden splinter.
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Question 2
Give a chemical test to distinguish between :
(a) Sodium chloride soln. and sodium nitrate soln.
(b) Hydrogen chloride gas and hydrogen sulphide gas.
(c) Calcium nitrate soln. and zinc nitrate soln.
(d) Carbon dioxide gas and sulphur dioxide gas.
(e) Sodium carbonate and sodium sulphite
(f) Ferrous nitrate and lead nitrate.
(g) Manganese dioxide and copper (Il) oxide.
(h) Sodium nitrate and sodium sulphite [using dilute sulphuric acid].
(i) Sodium chloride and sodium sulphide
(j) Sodium hydroxide solution and ammonium hydroxide solution.
(k) Ammonium sulphate and sodium sulphate.
(l) Sulphuric acid from nitric acid and hydrochloric acid.
(m) Magnesium chloride and magnesium nitrate solution
(n) Zinc sulphate solution and zinc chloride solution
(o) Iron (II) chloride soln. and iron (III) chloride soln.
(p) Calcium nitrate soln. and calcium chloride soln.