Question 1

Question 5To distinguish soluble salts of zinc and lead, ............... [NaOH/NH4OH] can be used.

Accepted Answer

To distinguish soluble salts of zinc and lead NaOH can be used.

Question 2

Question 6Oxides and hydroxides of certain metals i.e ............... [iron/ zinc/copper/aluminium/magnesium/lead] are amphoteric and react with ............... [acids/alkalis/acids and alkalis] to give salt and water.

Accepted Answer

Oxides and hydroxides of certain metals i.e zinc, aluminium, lead are amphoteric and react with acids and alkalis to give salt and water.

Question 3

Question 1Action of Sodium Hydroxide — on solutions of saltsComplete and balance the equations1a. Calcium nitrate andCa(NO3)2 + NaOH ⟶ ............... + ............... ↓1b. Magnesium ChlorideMgCl2 + NaOH ⟶ ............... + ............... ↓2. Iron [II] sulphateFeSO4 + NaOH ⟶ ............... + ............... ↓3. Iron [III] chlorideFeCl3 + NaOH ⟶ ............... + ............... ↓4. Copper [II] sulphateCuSO4 + NaOH ⟶ ............... + ............... ↓5. Zinc sulphateZnSO4 + NaOH ⟶ ............... + ............... ↓[Zn(OH)2 + NaOH [in excess] ⟶ ............... + ...............]6. Lead nitratePb(NO3)2 + NaOH ⟶ ............... + ............... ↓[Pb(OH)2 + NaOH [in excess] ⟶ ............... + ...............]

Accepted Answer

Action of Sodium Hydroxide — on solutions of saltsComplete and balance the equations1a. Calcium nitrate andCa(NO3)2 + 2NaOH ⟶ 2NaNO3 + Ca(OH)2 ↓1b. Magnesium ChlorideMgCl2 +2NaOH ⟶ 2NaCl + Mg(OH)2 ↓2. Iron [II] sulphateFeSO4 + 2NaOH ⟶ Na2SO4 + Fe(OH)2 ↓3. Iron [III] chlorideFeCl3 + 3NaOH ⟶ 3NaCl + Fe(OH)3 ↓4. Copper [II] sulphateCuSO4 + 2NaOH ⟶ Na2SO4 + Cu(OH)2 ↓5. Zinc sulphateZnSO4 + 2NaOH ⟶ Na2SO4 + Zn(OH)2 ↓[Zn(OH)2 + 2NaOH [in excess] ⟶ 2H2O + Na2ZnO2]6. Lead nitratePb(NO3)2 + 2NaOH ⟶ 2NaNO3 + Pb(OH)2 ↓[Pb(OH)2 + 2NaOH [excess] ⟶ 2H2O + Na2PbO2]

Question 4

Question 2Action of Ammonium Hydroxide — on solutions of salts   7. Magnesium chlorideMgCl2 + NH4OH ⟶ ............... + ............... ↓8. Iron [II] sulphateFeSO4 + NH4OH ⟶ ............... + ............... ↓9. Iron [III] chlorideFeCl3 + NH4OH ⟶ ............... + ............... ↓10. Copper [II] sulphateCuSO4 + NH4OH ⟶ ............... + ............... ↓[Cu(OH)2 + (NH4)2SO4 + NH4OH [in excess] ⟶ ............... + ............... ]11. Zinc sulphateZnSO4 + NH4OH ⟶ ............... + ............... ↓[Zn(OH)2 +(NH4)2SO4 + NH4OH [in excess] ⟶ ............... + ...............]12. Lead nitratePb(NO3)2 + NH4OH ⟶ ............... + ............... ↓

Accepted Answer

Action of Ammonium Hydroxide — on solutions of salts   7. Magnesium chlorideMgCl2 + 2NH4OH ⟶ 2NH4Cl + Mg(OH)2 ↓8. Iron [II] sulphateFeSO4 + 2NH4OH ⟶ (NH4)2SO4 + Fe(OH)2 ↓9. Iron [III] chlorideFeCl3 + 3NH4OH ⟶ 3NH4Cl + Fe(OH)3 ↓10. Copper [II] sulphateCuSO4 + 2NH4OH ⟶ (NH4)2SO4 + Cu(OH)2 ↓[Cu(OH)2 + (NH4)2SO4 + 2NH4OH [in excess] ⟶ 4H2O + [Cu(NH3)4]SO4]11. Zinc sulphateZnSO4 + 2NH4OH ⟶ (NH4)2SO4 + Zn(OH)2 ↓[Zn(OH)2 +(NH4)2SO4 + 2NH4OH [in excess] ⟶ 4H2O + [Zn(NH3)4]SO4]12. Lead nitratePb(NO3)2 + 2NH4OH ⟶ 2NH4NO3 + Pb(OH)2 ↓

Question 5

Question 3Action of Alkalis — on certain metals   13. ZincZn + NaOH ⟶ ............... + ...............14. ZincZn + KOH ⟶ ............... + ...............15. LeadPb + NaOH ⟶ ............... + ...............16. LeadPb + KOH ⟶ ............... + ...............17. AluminiumAl + NaOH + H2O ⟶ ............... + ...............18. AluminiumAl + KOH + H2O ⟶ ............... + ...............

Accepted Answer

Action of Alkalis — on certain metals   13. ZincZn + 2NaOH ⟶ Na2ZnO2 + H214. ZincZn + 2KOH ⟶ K2ZnO2 + H215. LeadPb + 2NaOH ⟶ Na2PbO2 + H216. LeadPb + 2KOH ⟶ K2PbO2 + H217. Aluminium2Al + 2NaOH + 2H2O ⟶ 2NaAlO2 + 3H218. Aluminium2Al + 2KOH + 2H2O ⟶ 2KAlO2 + 3H2

Question 6

Question 4Action of Alkalis — on oxides and hydroxides of certain metals   19. Zinc oxideZnO + NaOH ⟶ ............... + ...............20. Zinc hydroxideZn(OH)2 + NaOH ⟶ ............... + ...............21. Lead [II] oxidePbO + NaOH ⟶ ............... + ...............22. Lead hydroxidePb(OH)2 + NaOH ⟶ ............... + ...............23. Aluminium oxideAl2O3 + NaOH ⟶ ............... + ...............24. Aluminium hydroxideAl(OH)3 + KOH ⟶ ............... + ...............

Accepted Answer

Action of Alkalis — on oxides and hydroxides of certain metals   19. Zinc oxideZnO + 2NaOH ⟶ Na2ZnO2 + H2O20. Zinc hydroxideZn(OH)2 + 2NaOH ⟶ Na2ZnO2 + 2H2O21. Lead [II] oxidePbO + 2NaOH ⟶ Na2PbO2 + H2O22. Lead hydroxidePb(OH)2 + 2NaOH ⟶ Na2PbO2 + 2H2O23. Aluminium oxideAl2O3 + 2NaOH ⟶ 2NaAlO2 + H2O24. Aluminium hydroxideAl(OH)3 + KOH ⟶ KAlO2 + 2H2O

Analytical Chemistry — Use of Ammonium & Sodium Hydroxide

Additional Questions

Equation Worksheet