List IList IIA. Bi3+⟶(BiO)+p. HeatB. [AlO2]−⟶Al(OH)3q. HydrolysisC. SiO4−4⟶Si2O6−7r. AcidificationD. (B4O2−7)⟶B(OH)3s. dilution by water
A – q B – r C – p D –q,r
Bi3+⟶(BiO)+
The above is a clear, textbook example of hydrolysis. It is characteristic of Bi3+. We know that aluminium hydroxide (and alumina) are amphoteric. Observe this reaction of Al(OH)3 with NaOH
Al(OH)3+NaOH⟶Na[AlO2]+2H2O
It is in fact an equilibrium in reality. Any acidification will drive the reaction the backward direction.
Orthosilicates are converted to pyrosilicated by heating:
SiO4−4⟶Si2O6−7
Lastly, this is acidic hydrolysis:
Na2B4O7+2HCl+5H2O⟶2NaCl+4B(OH)3
A – q B – r C – p D –q,r