Question

write the formulae of copounds formed by :
1 .. Cr³+ and Fe -
2.. Pb ²+ and Po ³-
3.. Hg²+ and s²-
4.. Al ³+ and SO4 ² -

Answer 1

Answer:

These are to be solved by criss cross method, so we interchange the valencies

1. CrFe3
2. Pb3Po2
3. HgS In this the valency of Mercury and sulphur is same therefore the valencies are cancelled
4. Al2(SO4)3 In this we put the brackets around SO4 to indicate that 3 is applied to both sulphur and oxygen

Answer 2

Answer:

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