Which one of the following pairs does not imp | vedclass

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(C) When alkaline earth metals or their salts are heated,electrons are excited to higher energy levels due to the absorption of energy.When these elec

Vedclass · Accepted Answer

$BeCl_2$ and $MgCl_2$

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(C) When alkaline earth metals or their salts are heated,electrons are excited to higher energy levels due to the absorption of energy.When these electrons return to their ground states,they emit energy in the form of visible light,imparting a characteristic colour to the flame.$Be$ and $Mg$ atoms have very small sizes and high ionization enthalpies,meaning their electrons are too strongly bound to be excited by the energy of a Bunsen flame.Therefore,$Be$ and $Mg$ do not impart any colour to the flame.$Ca$,$Sr$,and $Ba$ impart brick red,crimson (blood red),and apple green colours,respectively.Thus,the pair that does not impart colour is $BeCl_2$ and $MgCl_2$.

Which one of the following pairs does not impart colour to the flame?

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