Write the thermal decomposition reaction of following compounds
(1) Pb(OH)₂
(2) Mg₂CO₃
(3) Ca(HCO₃)₂
(4) KNO₃
Answers
Question- Write the thermal decomposition reaction of following compounds
(1) Pb(OH)₂
(2) MgCO₃
(3) Ca(HCO₃)₂
(4) KNO₃
Answer- Thermal decomposition of given compounds is written below-
(1) Pb(OH)₂
Pb(OH)₂ -> PbO + H2O
Products formed will be lead oxide and water.
The temperature for this reaction is around 100-145° C.
(2) MgCO₃
MgCO₃ -> MgO + CO2
The products formed will be magnesium oxide and carbon dioxide.
The temperature of reaction will be around 350° C.
(3) Ca(HCO₃)₂
Ca(HCO₃)₂ -> CaCO3 + CO2 + H2O
The thermal decomposition of calcium bicarbonate will yield products namely, calcium carbonate, carbon dioxide and water.
The temperature of occurrence of this reaction is around 825° C
(4) KNO₃
KNO₃ -> KNO2 + O2
Potassium nitrate after undergoing thermal decomposition will give products namely, potassium nitrite and oxygen.
The temperature of reaction will be 400-520° C.