Question

Q-3 Write the chemical formulae of the following compounds using criss cross
formula.

1: Iron sulphate

2: Zink oxide

3: Copper sulphate

4: Sodium carbonate
​

Answer 1

Answer:

FeSO4

Zno

CuSO4

Na2CO3

Answer 2

$feso4$

$zno$

$cuso4$

$na2co3$