Question

(h) an
amphoteric oxide reduced by the basic gas,
(i) a white salt produced by an acidic gas and a basic gas.
When ammonium hydroxide is added to solution B, a pale
blue precipitate is formed. This pale blue precipitate
dissolves in excess ammonium hydroxide giving an inky
blue solution. What is the cation (positive ion] present in
solution B? What is the probable colour of solution B.
When an ammonium salt is warmed with sodium
hydroxide solution, a gas is evolved. State three ways in
which you could identify this ac​

Answer 1

Answer:

Heyy mate... your answer is...

h) Lead oxide is amophoteric and is reduced by basic gases.

i) CUSO4+2NH4OH gives (NH4)2SO4 + Cu(OH)2 (pale-blue)

The cation present in solution B is Copper (Cu +2)

The color of the solution B is blue.

The pale blue precipitate of copper hydroxide dissolves in excess ammonium hydroxide forming tetraamine copper [ ll ] sulphate, an azure blue ( deep blue ) soluble complex salt.

CU(OH)2 + (NH4)2SO4 + 2NH4OH gives [Cu (NH3)4]SO4+4H2O

The three ways in which the gas can be identified are as follows :

(a) It gives dense white fumes when a rod dipped in HCl is held in it.

(b) It turns moist red litmus paper blue.

(c) It turns phenolphthalein solution pink.

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