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Question
M is a bivalent metal. Write down the steps to find the chemical formulae of its compounds formed with the radicals, sulphate and phosphate.
Solution
The symbols and valencies of M and sulphate:
| symbols | M | SO4 |
| valencies | 2 | 2 |
Cross-multiply the valencies
The chemical formula is MSO4.
The symbols and valencies of M and phosphate:
| symbols | M | PO4 |
| valencies | 2 | 3 |
Cross-multiply the valencies
The chemical formula is M3(PO4)2.
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