AgCl
CaCO3
K2S04
NaOH
NH4CI
Explanation
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Discussions (11)
Mercury oxide, copper carbonate, copper sulfate, copper hydroxide, sodium nitrate, lead carbonate, and zinc carbonate can all undergo thermal decomposition reactions
Thermal dissociation is breaking a substance into two or simpler substances with the help of heating. These reactions are reversible. ... When a substance decomposes into two elements or two compounds in the presence of light, its an electrolytic decomposition.
The question is wrongly composed:
option B CaCO3 will also undergo thermal decomposition
Thermal decomposition is a reaction in which a compound is split into smaller fragments by heating, often releasing gases or vapour. It is an irreversible reaction.
e.g: 2KNO3 ⇒ 2KNO2 + O2
Thermal dissociation, however, is a reaction where a molecule is split into two or more molecules by heating. It is a reversible reaction.
e.g: NH4Cl ⇌ NH3 + HCl
Sometimes, both are used interchangeably
which of the following compounds will undergo thermal dissociation
+7
The correct answer is ✅ ammonium chloride.
Explanation
Ammonium chloride (
) undergoes thermal dissociation because it breaks down into ammonia (
) and hydrogen chloride (
) upon heating, and this process is reversible. Upon cooling, the gaseous products recombine to form the original solid ammonium chloride. In chemistry, thermal dissociation is specifically defined as a reversible decomposition of a substance caused by an increase in temperature.
Why other options are incorrect
While your query did not list specific options, common distractors in this context typically include:
❌ Potassium Chlorate (
): This undergoes thermal decomposition, not dissociation, because the reaction is irreversible and produces entirely different substances (potassium chloride and oxygen) that do not recombine upon cooling.
❌ Calcium Carbonate (
): While it breaks down into
and
when heated, this is categorized as thermal decomposition.
❌ Sodium Chloride (
): This compound is thermally stable at standard heating temperatures and does not undergo dissociation into its constituent elements or ions simply by heating in a typical laboratory setting.
❌ Ammonium Dichromate (
): This undergoes a violent, irreversible thermal decomposition (known as the "chemical volcano") to produce chromium(III) oxide, nitrogen, and water.
option B and E are both correct,kindly update your answers to avoid misleading scholars!!!
An elastic collision is a collision in which there is no net loss in kinetic energy in the system as a result of the collision. Both momentum and kinetic energy are conserved quantities in elastic collisions
