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2. A metal oxide which is soluble in excess of caustic soda is aluminium oxide (Al2O3).
Al2O3 (s) + 2NaOH (aq) + 3H2O (l) → 2Na[Al(OH)4] (aq)
3. a strong alkali is NaOH
4. A weak alkali is Ba(OH)2
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(a) Lead hydroxide [ Pb(OH)2 ]
(b) Zinc oxide [ ZnO ]
(c) Potassium hydroxide [KOH ]
(d) Ammonium hydroxide [ NH4OH ]
(e) (1) Potassium ion [ K+ ] (2) Sodium ion [ Na+ ]
(f) (1) Cupric (Blue) [ Cu2+ ] (2) Ferric (yellow) [ Fe3+ ]
(g) Metal is Zinc [Zn ]
(h) Two bases are ZnO and PbO
(i) Lead monoxide [ PbO ] yellow
(j) Lead dioxide [ PbO2 ]