Arrange the following oxides in order of increasing acidity: CO2,CaO,Al2O3,SO3,SiO2,P2O5.

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Identify the type of oxides: CO2, SO3, and P2O5 are non-metal oxides; CaO is a metal oxide; Al2O3 and SiO2 are amphoteric oxides.

Recall that non-metal oxides tend to be acidic, metal oxides tend to be basic, and amphoteric oxides can act as either acids or bases depending on the conditions.

Arrange the oxides based on their general acidic or basic nature: Metal oxides (basic) < Amphoteric oxides < Non-metal oxides (acidic).

Order the given oxides: Start with the most basic (CaO), followed by amphoteric (Al2O3, SiO2), and then the acidic oxides (CO2, SO3, P2O5).

Finalize the order of increasing acidity: CaO < Al2O3 < SiO2 < CO2 < SO3 < P2O5.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Acidity of Oxides

The acidity of oxides refers to their ability to react with water to form acids. Non-metal oxides, such as CO2 and SO3, tend to be acidic, while metal oxides, like CaO, are typically basic. The position of an oxide in the periodic table influences its acidity, with oxides of non-metals generally being more acidic than those of metals.

Periodic Trends

Periodic trends in the periodic table affect the properties of elements, including their oxides. As you move from left to right across a period, the oxides become more acidic due to increasing electronegativity and oxidation states. Conversely, moving down a group generally leads to more basic oxides as metallic character increases.

Classification of Oxides

Oxides can be classified as acidic, basic, or amphoteric based on their chemical behavior. Acidic oxides, like SO3 and P2O5, react with bases to form salts and water, while basic oxides, such as CaO, react with acids. Amphoteric oxides, like Al2O3, can exhibit both acidic and basic properties depending on the reaction conditions.

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