The decomposition of a salt is promoted by the formation of a new compound with high lattice energy. From BeCO3 and BeSO4, BeO will be formed by decomposition. The small doubly charged ions will result in very high lattice energy for BeO which will help to drive the reaction. (Reaction is also favoured by an increase in entropy since a gaseous product is formed).
Monday, April 13, 2020
Why alkali metals are normally kept in kerosene oil?
Alkall metals, when exposed to atmosphere react with oxygen, moisture and CO2 present in the air forming oxides, hydroxide and carbonates. In order to prevent the reaction the alkali metals are stored under kerosene.
Why LiCl is predominantly covalent while NaCl is ionic?
LiCl is covalent because Li+ ion is smaller in size as compared to Na+ ion and hence it has high polarising power than Na+ ion, as result LiCl is predominantly covalent while NaCl is ionic.
Why Li forms only oxides and not stable peroxide or superoxides ?
Lithium forms only oxides and not stable peroxide or superoxides, due to small size of Lithium, it has a strong positive field around it. On combination with the oxide anion (O-2), the positive field of lithium ion restricts the spread of negative charge towards another oxygen atom and thus prevents the formation of higher oxide.
What makes sodium highly reactive?
Low ionization enthalpy, strongly electropositive nature, tendency to attain noble gas configuration by the loss of one valence electron makes sodium highly reactive.
Subscribe to:
Posts (Atom)