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In question 13
G is formed by heating a carbonate and all carbonates on heating formed metal oxides.
Zinc oxide is white in color at low temperature but on heating it becomes yellow in color.Zno when combined to Cobalt oxide it gives green color and it is also called as philosopher's wool.
!4-
As we have seen the compound, the salt maybe the salt of zinc .Zn salts react with  hydroxide to form Zn(OH)2 which is insoluble in water. When excess of ammonium hydroxide is added it forms [Zn(OH)₄]^2-
Here the central atom Zn has SP³ hybridization because it is coordinated 4OH- ligands which are strong ligands.

G is probably a carbonate. Because of the fact that all carbonates on heating formes metal oxides.
For 13, the correct option is D.
Explanation:
Alchemists would burn zinc in the air and collect the residue, which formed into white woolly tufts. Alchemists called it Lana philosophical, meaning philosopher's wool. So compound G is philosopher's wool. Zno when heated with cobalt nitrate gives a green compound known as Rinmanr's green. So all options are correct.
For 14 the correct option is C.
Explanation: If the salt is of zinc then it will form Zn(OH)2 when react with the hydroxide. In excess ammonium hydroxide it forms [Zn(OH)4]2-.
n  [Zn(OH)4]2- the Zn is coordinated with 4 OH so it has sp3 hybridization which is option C so that's correct.