Question:

When sodium nitrate is heated above $ \text{600}{{\,}^{\text{o}}}\text{C,} $ then:

Updated On: Jun 20, 2022
  • only $ \text{N}{{\text{a}}_{\text{2}}}\text{O} $ is formed
  • only $ {{\text{N}}_{2}} $ is formed
  • only $ {{\text{O}}_{\text{2}}} $ is formed
  • all are formed
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The Correct Option is D

Solution and Explanation

On heating $ \text{NaN}{{\text{O}}_{\text{3}}} $ above $ \text{600}{{\,}^{\text{o}}}\text{C}\,\text{N}{{\text{a}}_{\text{2}}}\text{O,}\,{{\text{O}}_{\text{2}}} $ and $ {{\text{N}}_{2}} $ all is obtained as: $ 4NaN{{O}_{3}}\xrightarrow{800{{\,}^{o}}C}2N{{a}_{2}}O+5{{O}_{2}}+2{{N}_{2}} $
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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.