Why thermal stability of oxides decreases down the group?

Stability of oxides decreases down the group. Except BeO (predominantly covalent), all other oxides are ionic and their lattice energy decreases as the size of cation increases. The oxides are basic and basic nature increases from BeO to BaO (due to increasing ionic nature).

What is thermal stability of oxides?

The thermal stability of metallic oxides decreases from top to bottom in the electrochemical series because the electropositivity decreases from top to bottom and the thermal stability of the oxide also decreases from the top to bottom. Thus the given statement is true.

What is the thermal stability of carbonates of Group 2?

All these carbonates decompose on heating to given CO2 and metal oxide. The thermal stability of these carbonates increases down the group i.e., from Be to Ba. BeCO3 is unstable to the extent that it is stable only in atmosphere of CO2.

What is the nature of Group 2 oxides?

The oxides are basic and basic nature increases from BeO to BaO due to increasing ionic nature. BeO dissolves both in acid and alkalies to give salts and is amphoteric. The oxides of the alkaline earth metals except BeO and MgO dissolve in water to form basic hydroxides and evolve a large amount of heat.

What is thermal instability?

Thermal instability often arises when a fluid is heated from below. When the temperature difference across the layer is great enough, the stabilizing effects of viscosity and thermal conductivity are overcome by the destabilizing buoyancy, and an overturning instability ensues as thermal convection.

What is thermal stability Class 11?

Hint: The thermal stability is the stability of a water body and its resistance to mixing. It depends on the structure of the substance which in turn is dependent on the bonds between the atoms that hold that structure together. It decreases down the group.

What is the order of thermal stability in alkali metals?

LiH > NaH > KH > RbH.

Why does stability decrease from nh3 to bih3?

The stability of hydrides decreases down the group from NH3 to BiH3. This is due to a decrease in their bond dissociation enthalpy. Stability decreases down the group as the bond dissociation energy decreases. Hence, the bond dissociation energy decreases down the group due to the increase in the central atom size.

What is the trend in thermal stability of Group 2 carbonates?

What is the trend in thermal stability of Group 2 carbonates? Both carbonates and nitrates of Group 2 elements become more thermally stable down the group. The larger compounds further down require more heat than the lighter compounds in order to decompose.

Why does thermal stability increase down Group 2 nitrates?

Why does thermal stability increase down Group 2 nitrates? Both carbonates and nitrates of Group 2 elements become more thermally stable down the group. The larger compounds further down require more heat than the lighter compounds in order to decompose.

Why does the stability of +2 oxidation state increase down the group?

The stability of +2 oxidation state increases down the group because of inert pair effect. The reason for this is the pairing energy of the s-orbital electrons is more than the energy released during the bond formation.

What is the thermal stability of sulphate?

Thermal stability is the decomposition of compounds on heating. More the strong bonding more thermal stability. As we move down the group 2 the size of cations increases and sulphate is a big ion group according to its size. and big group of compounds are stable with big ionic group.