Which metal carbonate is most stable?
Barium carbonate is thermally the most stable. On moving down the group, the electropositive character of alkaline earth metals increases. Due to this, their thermal stability also increases.
Why does thermal stability of carbonates increase down the group?
Detailed Solution All the alkaline earth metals form carbonates. All these carbonates decompose on heating CO3 and metal oxides. Therefore, the thermal stability of these carbonates increases down the group. In the 2nd group carbonates, thermal stability increases down the group due to increases in lattice energy.
Why is CaCO3 more stable than MgCO3?
4 Answers. caco3 is more stable than mgco3 beacuse thermal stability of carbonates of group 2 will increase down the group with the increase in the size of cation . this is beacuse longer cation will stabilize the larger carbonate ion .
What metals form stable carbonates?
Alkali metals form strong bases (alkali metal hydroxide) and their carbonates are stable. Hence the metal is alkali metal and belongs to group IA.
Which of the following carbonates are more stable?
Among, the given metal carbonates, caesium carbonate is most stable.
Which one is the most stable carbonate a BaCO3 B MgCO3 C CaCO3 D BeCO3?
BaCO3 is more thermally stable because polarising power of Ba2+ is less than other alkaline earth metals and thermal stability is inversely proportional to polarising power of action when compound containing polyatomic anion and here carbonate is polyatomic anion.
Why does stability decrease down a group?
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. The hydrides of these elements are pyramidal with a lone pair of electrons in one of the orbitals.
Why does stability increase down a group?
The thermal stability increases as you go down Group 2. This is because the Group2 ion has lower charge density, and thus distorts the carbonate ion less. The less distorted the carbonate ion is, the more stable it is, and so a higher temperature is required to decompose the carbonate.
Which is more stable Na2CO3 and CaCO3?
So, lesser heat is required to break sodium carbonate than calcium carbonate. Thus, calcium carbonate is more stable than sodium carbonate. Hope it helps.
Which is more thermally stable CaCO3 or MgCO3?
MgCO3 is thermally more stable than CaCO3 .
Which carbonate decomposes most easily?
Barium carbonate decomposes most easily.
What is thermal stability of carbonates?
As we move down the group the stability of metal carbonates increases as the size of metal atom increases leading to the formation of strong ionic bond. The correct order of thermal stability of carbonates: MgCO3.
What determines the stability of a metal carbonate?
The stability of the metal carbonates can be related to the reactivity series of metals. The higher up the series a metal is, the more reactive the metal is and so the more stable the metal carbonate is.
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 are carbonates more stable than other alkali metals?
Stability of carbonates increases down group I (alkali) and group II (alkaline earth) metals. The carbonate ion has a big ionic radius so it is easily polarized by a small, highly charged cation.
How does the degree of polarization affect the stability of carbonates?
The degree of polarization of the carbonate ion by the group I cations follow the order: The greater the polarization of the carbonate ion, the easier it is to weaken a carbon-oxygen bond in th Stability of carbonates increases down group I (alkali) and group II (alkaline earth) metals.