Question:

The compound which does not exist.

Updated On: Oct 7, 2024
  • BeCl2
  • NaO2

  • PbEt4
  • (NH4)2 BeF4
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The Correct Option is B

Approach Solution - 1

The compound that does not exist is Nao2. The correct formula for the compound should be Na2O, which is sodium oxide.
BeCl2, PbEt4, and (NH4)2BeF4 are all valid chemical compounds. BeCl2 is beryllium chloride, PbEt4 is tetraethyllead, and (NH4)2BeF4 is ammonium beryllium fluoride.
Answer. B
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Approach Solution -2

The correct answer is NaO2

Lithium forms oxide, sodium forms peroxide and the K, Rb, Cs forms superoxide.

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Concepts Used:

Group 1 Elements

Group one of alkali metals is s-block elements with just one electron in their s-orbital. They are are alkali metals. They are named so because of the alkaline nature of the hydroxides and oxides.

Alkali metals are characterized by one s-electron in the valence shell of their atoms.

Alkali metals have a corresponding [Noble gas] ns1 electronic configuration. They occupy the first column of the periodic table. Alkali elements are:

  • Lithium(Li)
  • Sodium(Na)
  • Potassium (K)
  • Rubidium (Ru)
  • Cesium (Cs)
  • Francium (Fr)

They have occupied successive periods from first to seven. Francium is a radioactive element with very low half-life.

Electronic Configuration:

  • Alkali metals have one electron in their valence shell.
  • The electronic configuration is given by ns1. For example, the electronic configuration of lithium is given by 1ns1 2ns1.
  • They tend to lose the outer shell electron to form cations with charge +1 (monovalent ions).

This makes them the most electropositive elements and due to the same reason, they are not found in the pure state.