Question
Download Solution PDFAn element A forms an oxide with the formula A3O4. What is the valency of element A?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is 4
Key Points
- Oxides are compounds that are combined with one or more oxygen atoms, for example, Carbon dioxide (CO2), Water (H2O), Nitrogen oxide (NO2) etc.
- Mixed oxide forms when two or more simple oxides combine and these simple oxides can be the same or different.
- A3O4 is an undefined mixed oxide and is a mixture of A2O3 and AO and so the element two-thirds of A has a valency of 3 and one-third has a valency of 2.
- Oxygen, a non-metal that has an atomic number of 8, is a 16th-group element and Lead (Pb) is a 14th-group element with an atomic number of 82.
- The valency of oxygen is 2 and that of Lead is 4.
- Pb3O4 is a mixed oxide of two compounds PbO and PbO2. The number of oxygen atoms is 4 and so the total valency is given as 8.
- The difference between the oxygen total valency and the Lead (Pb) valency (which is 4) gives the valency of the compound i.e., 8-4 = 4. Hence option 4 is correct
Additional Information
- Oxides are divided into different types based on valency: Simple oxides, Acidic oxides, Basic oxides and Mixed oxides.
- Simple Oxides are made up of one metal and carry only that number of oxygen atoms allowed by the normal valency of the element or metal.
- Examples of simple oxides include H2O, MgO etc.
- Acidic oxide, formed by non-metals reacts with water and produces acid. For example, SO2, CO2 etc.
- The basic oxide reacts with water to give a base and is basic in nature, for example, Na2O, CaO etc.
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