As the atomic number increases, the difference in the stability of metal cation and the oxide anion increases. … Hence, the stability of the carbonate increases. Thus, among the given carbonates, the order of thermal stability is BaCO3>CaCO3>MgCO3.
Likewise, Why is na2co3 thermally stable?
All the carbonates present in this group undergo thermal decomposition to form metal oxide and carbon dioxide gas. … On moving down in the group of alkali metal, the electropositive character of the metal increases which increases the thermal stability of the metal carbonate.
Also, Which carbonate is most stable?
Barium carbonate is thermally the most stable.
Secondly, Which is more stable ZnCO3 or MgCO3?
ZnCO3 is thermally more stable than MgCO3 because polarising action of Zn2+ with 18-electron configuration on the anion is larger than that of Mg2+ with a noble-gas electron configuration and of same size and charge.
Furthermore Why BaCO3 is most thermally stable? Hence, carbonate of alkaline earths decompose into oxide and CO2. Large cations like Ba2+ have low ionic potential and are unable to polarise the electrons of O atom due to which carbonates of large cations are more stable.
Which is more stable Li2CO3 or Na2CO3?
Lithium carbonate is less stable than sodium carbonate as Li is less electropositive than sodium. … Small sized Li polarizes large carbonate ion which leads to formation of Li2O and CO2. Since, sodium carbonate is very stable, it decomposes at high temperature.
Is Li2CO3 thermally more stable than Na2CO3?
Na2CO3 is thermally very stable than Li2CO3.
Which is least thermally stable Li2CO3?
Lithium Carbonate is not thermally stable and has the lowest thermal stability among the above. It decomposes without heating to form carbon dioxide and lithium oxide. This is due to the large size difference, polarization of the carbonate ion and the covalent nature of the compound.
Which metal carbonate is hardest to decompose?
This means that sodium carbonate is very stable and requires a high temperature to decompose. However, copper is a very unreactive metal, which is why it is useful for making water pipes, and so copper(II) carbonate is quite unstable and decomposes at a relatively low temperature.
Which is least thermally stable?
BeCO3 is least thermally stable. The thermal stability of carbonates increases down the group i.e from Be to Ba.
Is znco3 amphoteric?
$Mg{(OH)_2}$ exhibits only basic properties while $Zn{(OH)_2}$ is amphoteric. B. Polarising action of $Z{n^{ + 2}}$ with 18-electron configuration on the anion is larger than that of $M{g^{ + 2}}$ with noble gas electron configuration of the same size and charge.
Which is more stable MgCO3 or SrCO3?
MgCO3 is most stable alkaline earth metal because it is present in first period. Due to this its nuclear charge is less as compare to other. Due to its less nuclear charge its bond length is small thus it is more stable.
Why is BeCO3 unstable?
BeCO3 is very unstable mainly because of the enhanced stability of BeO over BeCO3. Cations with high ionic potential have large power of polarisation. In crystalline solid, the M2+ cation is surrounded by oxygen of CO32- ions.
Why is CaCO3 thermally unstable?
Calcium carbonate decomposes at a higher temperature (840C) than does magnesium carbonate (350C). The attraction of calcium for the adjacent oxygen atoms of the carbonates is greater than that of magnesium. Therefore, more energy (higher temperature) is required to break apart CaCO3 to form CaO and CO2.
Why li2co3 is thermally unstable?
However, lithium carbonate is not so stable to heat. This is because lithium carbonate is covalent. … Therefore, lithium carbonate decomposes at a low temperature while a stable sodium carbonate decomposes at a high temperature.
Is K2CO3 thermally unstable?
Lithium is higher up in the group than potassium and it has a higher first ionization energy than potassium. It is harder to remove the outermost electron in Li than in K making it more covalently bonding than K. Both of the compounds decompose but thermal stability increases as one moves down the group.
Which is least thermally stable li2co3 k2co3 na2co3 cs2co3?
Li2CO3 is least stable.
Which is the least thermally stable?
Least thermal stable is BeCO3.
Which is the least thermally stable carbonate?
BeCO3 is least thermally stable. The thermal stability of carbonates increases down the group i.e from Be to Ba.
Which is the lowest thermal stability?
1 Answer
- Correct option (a) Li 2 CO 3
- Since the alkali metals are highly electropositive, their carbonates are highly stable towards heat. As the electropositivity increases down the group, the stability is in order of :
- Cs 2 CO 3 >Rb 2 CO 3 > K 2 CO 3 > Na 2 CO 3 > Li 2 CO 3
- Lithium carbonate decomposes on heating.
Is MgCO3 thermally stable?
MgCO3 is thermally more stable than CaCO3 .
Is potassium carbonate stable to heat?
Thus, sodium carbonate and potassium carbonate are thermally stable. They do not decompose on heating.
What does copper carbonate decompose into?
Basic copper carbonate is decomposed by acids, such as solutions of hydrochloric acid HCl, into the copper(II) salt and carbon dioxide. In 1794 the French chemist Joseph Louis Proust (1754–1826) thermally decomposed copper carbonate to CO2 and CuO, cupric oxide.
Which is least thermally stable li2co3?
Lithium Carbonate is not thermally stable and has the lowest thermal stability among the above. It decomposes without heating to form carbon dioxide and lithium oxide. This is due to the large size difference, polarization of the carbonate ion and the covalent nature of the compound.
Which hydride is most stable?
NH3 is the most stable hydride among the hydrides of group 15 elements because the strength of E-H (Here E = N, P, As, Sb, or Br) bond decreases down the group due to increase in size of the central atom.
Why does thermal stability increase down the group?
The thermal stability increases as you go down Group 2. This is because the Group 2 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. … ions in solution.
Don’t forget to share this post on Facebook and Twitter !