Question

Write formulae for the chlorides and oxides formed by chromium and copper

Answer 1

Answer:

cucl2 and crcl2

Explanation:

because they have valency 2

Answer 2

The formulae for chlorides and oxides formed by chromium and copper are:-

Copper chloride = CuCl2 and Copper oxide = CuO

Chromium chloride =CrCl3/ CrCl2 and Chromium oxide = CrO3 / CrO

Both chromium and copper belong to d block of periodic table so can show variable oxidation states due to vacant d orbitals.

So chromium has two most stable oxidation state with +2 and +3 so valency of chromium will be +2 and +3 chloride has valency of -1 and oxide has valency of -2 so formula of compounds will be according to criss cross method.

Now for copper the stable oxidation state while forming compound is +2 so valency for copper is +2 and chloride valency is -1 so formula will be CuCl2 so one copper will be surrounded by 2 chlorine atoms.

And for oxide as valency of oxygen is -2 so formula is CuO that is one copper atom is bonded with one oxygen atom.