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  • Which among the following shows the diagonal relationship of Li and Mg? Both form nitrides Both

Which among the following shows the diagonal relationship of Li and Mg?

  1. Both form nitrides
  2. Both combine with excess oxygen to give superoxides.
  3. Carbonates of both decompose easily on heating
Option: 1

A only


Option: 2

B & C only


Option: 3

A & C only


Option: 4

A & B only


Answers (1)

best_answer

Due to similar size of Li and Mg they show similar properties. 

Both \mathrm{Li} and \mathrm{Mg} react with \mathrm{N}_2 to form respective nitrides

\mathrm{Li} and \mathrm{Mg} form \mathrm{Li}_2 \mathrm{O} and \mathrm{MgO} on reacting with oxygen. They don't combine with excess oxygen to give superoxides.

Stability of carbonate increases down the group due to increase in electropositive character. So \mathrm{Li}_2 \mathrm{CO}_3 and \mathrm{MgCO}_3 are less stable and hence are easily decomposed on heating.

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