Question

Write down the decomposition reactions of following compounds
1. MgCO3 (Magnesium carbonate)
2. Mg(NO3)2 (Magnesium nitrate)
3.Li2CO3 (Lithium carbonate)
4.CsNO3 (Ceasium nitrate)

Answer 1

Answer:

a) Mg2+ and (CO3)2-

b) Mg2+ and (NO3)-

c) Li+ and (CO3)2-

d) Cs+ and NO3-

Answer 2

Magnesium carbonate:

The thermal decomposition of magnesium carbonate to produce magnesium oxide and carbon dioxide. This reaction takes place at a temperature of over 650°C

MgCO3 → MgO co2

Magnesium nitrate

Since magnesium nitrate has a high affinity for water, heating the hexahydrate does not result in the dehydration of the salt, but rather its decomposition into magnesium oxide, oxygen, and nitrogen oxides:

2 Mg(NO3)2 → 2 MgO + 4 NO2 + O2.

The absorption of these nitrogen oxides in water is one possible route to synthesize nitric acid. Although inefficient, this method does not require the use of any strong acid.It is also occasionally used as a desiccant.

Lithium carbonate

The first decomposition temperature of carbonate was 1000 K in argon gas. Decomposition of lithium carbonate was a complex process, including the multiple reactions such as melting of lithium carbonate, dissolution of Li2O and CO2 in Li2CO3, and adsorption of CO2 in Li2O.

Caesium nitrate

2CsNO3. 2CsNO2 + O. 2

The thermal decomposition of cesium nitrate to produce cesium nitrite and oxygen. This reaction takes place at a temperature of 585-850°C.