The correct order of increasing thermal stability of $K_2CO_3, MgCO_3, CaCO_3 $ and $ BeCO_3$ is
- $BeCO_3 < MgCO_3 < K_2CO_3 < CaCO_3$
- $BeCO_3 < MgCO_3 < CaCO_3 < K_2CO_3$
- $MgCO_3 < BeCO_3 < CaCO_3 < K_2CO_3 $
- $ K_2CO_3 < MgCO_3 < CaCO_3 < BeCO_3 $
The Correct Option is B
Solution and Explanation
is
$BeCO_3 < MgCO_3 < CaCO_3 < K_2CO_3$
$Be, Mg$ and $Ca$ are present in second group and $K$ is present in first group
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Concepts Used:
Group 2 Elements
The group two or alkaline earth metals are s-block elements with two electrons in their s-orbital. They are alkaline earth metals. They are named so because of the alkaline nature of the hydroxides and oxides.
Alkaline earth metals are characterized by two s-electrons. This group of elements includes:
- Beryllium (Be)
- Magnesium (Mg)
- Calcium (Ca)
- Strontium (Sr)
- Barium (Ba)
- Radium (Ra)
Elements whose atoms have their s-subshell filled with their two valence electrons are called alkaline earth metals. Their general electronic configuration is [Noble gas] ns2. They occupy the second column of the periodic table and so-called as group two metals also.