Question

Heating of sugar is called.......... reaction

a)combination
b)displacement
c)Double Displacement
d)Decomposition

Answer 1

Decomposition reaction

Answer 2

Answer:

Heating of sugar is called decomposition reaction.

Therefore, the option (d) is correct.

Explanation:

• Decomposition reaction is the chemical reaction in which a compound breaks into one into two or more simple compounds. The decomposition occurs on heating is called thermal decomposition reaction.

• Sugar (sucrose) is a carbohydrate means hydrate of carbon. The chemical formula of sucrose is C₁₂H₂₂O₁₁.

• On heating, sucrose decomposes to two carbon atoms and 11 water molecules.

         C₁₂H₂₂O₁₁ $\longrightarrow$  12C  +  11H₂O

• Water is lost in the form of steam and only black ashes remains which is carbon.
• When sugar is  heated at very high temperature, a black powdery substance is obtained is called charred sugar. Decomposition of sugar on heating is a chemical change.