Home › ICSE Class 9 › chemistry › The Language of Chemistry › Magnesium has valency 2; phosphate radical has v…
Magnesium has valency 2; phosphate radical has valency 3. Formula of magnesium phosphate is
AMg2PO4 directly
BMg2(PO4)3 directly
CMg3(PO4)2
DMg3PO4 directly
Answer & Solution
Correct answer: C. Mg3(PO4)2
1. Use criss-cross with valencies 2 (Mg) and 3 (PO4).
2. Mg gets subscript 3; PO4 gets subscript 2.
3. Neutral formula: Mg3(PO4)2.
4. Check: 3(+2) + 2(-3) = 0, balanced.
_Source: Selina Concise Chemistry Class 9, Ch 4 The Language of Chemistry (Mistral OCR'd PDF), section on chemical formula_
Related questions
If the formula of a compound is M2O3 and oxygen has valency 2, then valency of M isWhich symbol denotes copper, from its Latin name Cuprum?An equation written with a double arrow indicates a reaction that isWhich state symbol in a chemical equation denotes a substance dissolved in water?Number of oxygen atoms in one molecule of potassium permanganate KMnO4 isMolecular mass of glucose C6H12O6 (C=12, H=1, O=16) isMolecular mass of H2SO4 (H=1, S=32, O=16) isBalance: Fe + H2O -> Fe3O4 + H2. Coefficient of H2O is