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प्रश्न
What is variable valency ? Give two examples of elements showing variable valency.
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उत्तर
Certain elements exhibit more than one valency, that means they show variable valency.
Ferrous is written as Iron (II) and Ferric is written as Iron (III).
| Metal | Radicals | Valency |
| Iron | Ferrous [Iron (II)] Ferric [Iron (III)] |
2 3 |
| Copper | Cuprous [Copper (I)] Cupric [Copper (II)] |
1 2 |
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संबंधित प्रश्न
The valency of aluminium is 3. Write the valency of other radicals present in the following compounds of Aluminium oxide.
Write the molecular formulae of Iron (III) chloride
Write the molecular formulae of Magnesium carbonate.
Write the molecular formulae of Ammonium carbonate.
Write the chemical formula of the following compound in a step-by-step manner –
Sodium bromide
Write the chemical formula of the following compound in a step-by-step manner –
Calcium bicarbonate
Write the chemical formula of the following compound in a step-by-step manner –
Potassium dichromate
Write the chemical formula of the following compound in a step-by-step manner –
Copper [I] sulphide
Write the chemical formula of the following compound in a step-by-step manner –
Iron [III] chloride
Complete the statement given below by filling in the blanks with the correct words.
The valency of iron in FeO is _______ of chlorine [chloride] in CaCl2 is ________ and of dichromate in K2 Cr2 O7 is ________.
