Page 2 - Microsoft Word - Module-2

Halides:

 Prepared by reaction of oxide, hydroxide or

carbonate with aqueous hydrohalic acid.

 The melting points of metallic halides follow this

order: MF > MCl > MBr > MI

 All halides are soluble in water except LiF which has

low solubility due to its high lattice energy.

 CsI has low solubility due to small hydration energy.

Salts of Oxo-acids:

 Oxo acids are those in which the acidic proton is on a

hydroxyl group with an Oxo group attached to the

same atom e.g. H CO [OC (OH) ].
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 The stability of carbonates and bicarbonates

increases down the group.

CAUSE OF ANOMALOUS PROPERTIES OF LITHIUM

(i)Exceptionally small size of its atom and ion.

(ii)High polarizing power.

(iii)Diagonal relationship to magnesium.

(iv)High ionization enthalpy.