MgCl2
The order of hydration energy of alkaline earth
metal is
Be2+ > Mg2+ > Ca2+
> Sr2+ > Ba2+
Match the flame colours of the alkali and alkaline
earth metal salts in the bunsen burner
(p) Sodium (1) Brick red
(q) Calcium (2) Yellow
(r) Barium (3) Violet
(s) Strontium (4) Apple green
(t) Cesium (5) Crimson red
(u) Potassium (6) Blue
(p) sodium –yellow (2)
(q) Calcium – Brick red (1)
(r) Barium – apple green (4)
(s) Strontium – Crimson red (5)
(t) Cesium – blue (6)
(u) Potassium – Violet (3)
Among alkali and alkaline earth metals,
K, Rb and Cs alone forms superoxides.
Superoxide O2– has 3 electron
bond.
Assertion : BeSO4 is soluble in water
while BaSO4 is not
Solubility of carbonates decreases down the group
and hence the correct order of solubility is,
MgCO3 > CaCO3 > SrCO3
> BaCO3
Slaked lime Ca(OH)2
The suspension is called milk of lime and the clear
solution is called lime water.