In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it
In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it
CO2 < SiO2 < SnO2 < PbO2 :Increasing oxidizing power
HF < HCl< HBr < HI:Increasing acidic strength
H2O < H2S< H2Se < H2Te:Increasing pKa values
NH3 < PH3< AsH3 < SbH3:Increasing acidic character
The Correct Option is C
Solution and Explanation
The correct answer is option (C) : H2O < H2S< H2Se < H2Te:Increasing pKa values
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Concepts Used:
Group 16 Elements
The group 16 elements (oxygen group elements) of the periodic classification are also known as chalcogens because most of the copper ores have copper in the form of oxides and sulphides. The word chalcogen means “ore formation” which is derived from the Greek word “Chalcos” (Ore) and “gen” (formation).
There are 5 elements that come under Group 16 of the Modern Periodic Table namely:
- Oxygen (O)
- Sulphur (S)
- Selenium (Se)
- Tellurium (Te)
- Polonium (PO)
Electronic Configuration:
The general electronic configuration of the chalcogens can be written as ‘ns2np4’, where ‘n’ denotes the value of the principal quantum number corresponding to the valence shell of the element.
The electron configuration of the synthetic element livermorium (believed to be a chalcogen) is predicted to be [Rn]5f146d107s27p4.
Metallic Nature of the Group 16 Elements:
- Oxygen and sulfur are classified as non-metals.
- Selenium and tellurium are classified as metalloids.
- Under standard conditions, polonium exhibits metallic characteristics. However, it is important to note that polonium is a radioactive element.