Arrange the following oxides in order of increasing acidity.

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Question:

Arrange the following oxides in order of increasing acidity. Rank from least acidic to most acidic. To rank items as equivalent,overlap them.
CaO
P2O5
SO3
SiO2
Al2O3
CO2

Answer:

Since acidity increases across a period from left to right, and decreases down a group, the oxides can be ranked from the least acidic to the most acidic as follows:

  • The least acidic is CaO
  • The most acidic is

Note the following:

  • Acidity of an oxide depends on its electronegativity.
  • Non-metals are more electronegative, while metals are less electronegative.
  • Acidity of oxides increases across a period as you move from left to the right side of a periodic table.
  • Acidity of oxides decreases down a group (column) in a periodic table.

Using the periodic table diagram given in the attachment below, we can rank the given oxides according to their increasing acidity.

  • CaO, is the least, because it is an oxide of the metal, Calcium, which is at the far left in group 2 in the periodic table.
  • The next is, . Aluminum is a metal from group 3.

  • is an oxide of Silicon, also in group 4 but below Carbon.
  • is an oxide of Carbon, from group 4.

  • is an oxide of the non-metal, Phosphorus, a group 5 element

  • is an oxide of the non-metal, Sulphur, a group 6 element.

Therefore, since acidity increases across a period from left to right, and decreases down a group, the oxides can be ranked from the least acidic to the most acidic as follows:

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