Question

name :
1. black metallic oxide which reacts with hydrochloric acid to give coloured solution
2. two gases which chemically combine to form a liquid
3. a chemical in which gold can be dissolve
4. the gas produced when chlorine water is exposed to sunlight

Answer 1

Hello friend!!
I'm Rajdeep!!

1. The black metallic oxide is Copper oxide.
Reaction: CuO + HCl ------> CuCl2 + H2O
Colour of CuCl2 is BLUE.

2. Ammonia and excess chlorine combine to form a yellow colours explosive liquid, nitrogen trichloride.

3. Gold can be dissolved in aqua Regia, which is prepared by mixing 1 volume of conc. nitric acid and 3 volumes of conc.Hydrochloric acid.

4. When chlorine water is exposed to sunlight, two acids are formed: HCl and HClO
Cl2 + H2O ------> HCl + HClO


Thanks!!

Answer 2

Answer:

1 Cuo.

2 H2 and O 2

3. Aqua regia.

4. HCL