Chemistry
Name:
(a) a metallic hydroxide soluble in excess of NH4OH.
(b) a metallic oxide soluble in excess of caustic soda solution.
(c) a strong alkali.
(d) a weak alkali.
(e) two colourless metal ions.
(f) two coloured metal ions.
(g) a metal that evolves a gas which burns with a pop sound when boiled with alkali solutions.
(h) two bases which are not alkalis but dissolve in strong alkalis.
(i) a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.
(j) a colourless cation not a representative element.
(k) a yellow monoxide that dissolves in hot and concentrated caustic alkali.
(l) a white, insoluble oxide that dissolves when fused with caustic soda or caustic potash.
(m) a compound containing zinc in the anion.
Answer
(a) Copper hydroxide [Cu(OH)2]
(b) Zinc oxide [ZnO]
(c) Sodium hydroxide [NaOH]
(d) Ammonium hydroxide [NH4OH]
(e) Sodium ion [Na+] , Potassium ion [K+]
(f) Cupric ion [Cu2+], Ferrous ion [Fe2+]
(g) Aluminium [Al]
(h) Zinc hydroxide [Zn(OH)2] and Lead hydroxide [Pb(OH)2]
(i) Lead oxide [PbO]
(j) Ammonium ion [NH4+]
(k) Lead oxide [PbO]
(l) Zinc oxide [ZnO]
(m) Potassium Zincate [K2ZnO2]
Related Questions
You are provided with two reagent bottles marked A and B. One contains NH4OH solution and the other contains NaOH solution. How will you identify them by a chemical test?
(a) What do you understand by amphoteric oxide?
(b) Give the balanced equations for the reaction with two different amphoteric oxides with a caustic alkali.
(c) Name the products formed.
On adding dilute ammonia solution to a colourless solution of a salt, a white gelatinous precipitate appears. This precipitate however dissolves on addition of excess of ammonia solution.
(a) From the following list, identify which metal salt solution was used above?
Na, Al, Zn, Pb, Fe(b) What is the formula of the white gelatinous precipitate obtained?
(c) Give the balanced equation(s) when sulphate of this metal reacts with ammonia solution in excess.