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प्रश्न
Correct the following statement:
Formula of iron (lll) oxide is FeO.
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उत्तर
Formula of iron (lll) oxide is Fe2O3.
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संबंधित प्रश्न
Write down the formula of aluminium chloride.
Write the chemical formula of the Magnesium chloride.
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A molecular formula represents an element.
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Play a game for writing formula.
Example 2: A low-cost model for writing formulae: Take empty blister packs of medicines. Cut them in groups according to the valency of the element, as shown in the figure. Now, you can make formulae by fixing one type of ion into other.
For example:

The formula for sodium sulphate:
2 sodium ions can be fixed on one sulphate ion.
Hence, the formula will be Na2SO4.
Do it yourself:
Now, write the formula of sodium phosphate.
