Question:

The correct order of acidic strength is

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The acidic strength of non-metallic oxides increases along the periodic table. 

Updated On: Sep 11, 2023
  • $K_2O > CaO > MgO$
  • $CO_2 > N_2O_5 > SO_3$
  • $Na_2O > MgO > Al_2O_3$
  • $Cl_2O_7 > SO_2 > P_4O_{10}$
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The Correct Option is D

Solution and Explanation

The correct order of acidic strength is Cl2O7​ > SO2 >P4O10

For non-metallic oxides, acidic strength increases along the periodic table. 

The correct order of acidic strength is based on the ability of the compounds to release protons (H+) in an aqueous solution.

  1. Cl2O7 (dichlorine heptoxide) is the strongest acid among the three. This is because it can readily release two H+ ions when dissolved in water, leading to the formation of two HClO4 molecules.
  2. SO2 (sulfur dioxide) is the next strongest acid as it can release one H+ ion in an aqueous solution, forming H2SO3.
  3. P4O10 (tetra phosphorus decaoxide) is the weakest acid among the three. It reacts with water to form phosphoric acid (H3PO4) but releases fewer H+ ions compared to Cl2O7 and SO2.
Cl2O7

Hence, the correct order of acidic strength is Cl2O7 > SO2 > P4O10.

Therefore, the correct answer is option D

Discover More Topics From Chapter: Group 15 Elements

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Concepts Used:

Group 15 Elements

Group 15 elements are also known as nitrogen group elements or nitrogen family

It consists of:

  • Nitrogen (N)
  • Phosphorus (P)
  • Arsenic (As)
  • Antimony (Sb)
  • Bismuth (Bi)
  • Moscovium (Mc)

They are present on the right side of the periodic table. All the elements are arranged based on their atomic weight. The elements with similar properties reside in a column called the group.

All Group 15 elements have the electron configuration ns2np3 in their outer shell, where n is the principal quantum number.

Periodic Trends in Group 15 Elements