00:01
All the given compounds are ionic compounds and the name of ionic compound consists of the name of cation as well as the name of anion.
00:13
They are named as starting with the name of cation and then anion.
00:20
Some anions have multiple forms and thus they are named according to use of roman numerals in the brackets showing their oxidation number.
00:33
Now the first name is ferrous permanganate.
00:43
In this the cation is ferrous that means ferrous is for fe2 +, the name is for fe2 +, that is a ion of iron and permanganate is mno4-.
00:58
So when their formula is written it becomes equal to femno4 - as by crisscross method this one charge becomes the subscript of iron and this two becomes the subscript of mno4.
01:18
So its formula is written correct.
01:22
Next compound is cobalt 3 chloride.
01:25
In this compound the cation is cobalt 3 and the anion is chloride so its formula is cocl3.
01:34
Its formula is given cocl3 is the correct formula not co3cl.
01:44
So second match is incorrect...