Question

Action of Alkalis — on certain metals
Zinc Zn + NaOH ⟶ ____ + ____
Zinc Zn + KOH ⟶ ____ + ____
Lead Pb + NaOH ⟶ ____ + ____
Lead Pb + KOH ⟶ ____ + ____
Aluminium Al + NaOH + H2O ⟶ ____ + ____
Aluminium Al + KOH + H2O ⟶ ____ + ____

  • Analytical Chemistry
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Answer

Zinc Zn + NaOH ⟶ Na2ZnO2 + H2
Zinc Zn + KOH ⟶ K2ZnO2 + H2
Lead Pb + NaOH ⟶ Na2PbO2 + H2
Lead Pb + KOH ⟶ K2PbO2 + H2
Aluminium Al + NaOH + H2O ⟶ 2NaAlO2 + 3H2
Aluminium Al + KOH + H2O ⟶ 2KAlO2 + 3H2

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Action of Ammonium Hydroxide – on solutions of salts

Magnesium chloride MgCl2 + NH4OH ⟶ ____ + ____ ↓
Iron [II] sulphate FeSO4 + NH4OH ⟶ ____ + ____ ↓
Iron [III] chloride FeCl3 + NH4OH ⟶ ____ + ____ ↓
Copper [II] sulphate CuSO4 + NH4OH ⟶ ____ + ____ ↓ [Cu(OH)2 + (NH4)2SO4 + NH4OH [in excess] ⟶ ____ + ____]
Zinc sulphate ZnSO4 + NH4OH ⟶ ____ + ____ ↓ [Zn(OH)2 +(NH4)2SO4 + NH4OH [in excess] ⟶ ____ + ____]
Lead nitrate Pb(NO3)2 + NH4OH ⟶ ____ + ____↓

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