Which of the following does not involve a chemical reaction ?

(a) digestion of food in our body

(b) process of respiration

(c) burning of candle wax when heated

(d) melting of candle wax on heating

Open in App

Solution

The chemical reaction is the process in which the chemical change occurs and reactant will convert into chemically different product.
So, the
(1) Chemical digestion is also the chemical process.
(2) Respiration is the chemical process.
(3) Burning of wax of candle is the chemical process.
(4) Melting of wax is the physical process in which solid wax converts into liquid wax while there is no other changes in the chemical environment.

Hence the correct option (D)

Suggest Corrections

Similar questions

We observe that some portion of wax (in a candle) melts and another portion of it is used in producing heat and light.
Statement A: The melting of wax is a physical change
Statement B: The burning of wax for the production of heat and light is a chemical change.

Q. Which of the following are physical changes and which are chemical changes ?
Burning of candle wax, Melting of candle wax, Mixing of iron filings and sand, Burning of wood, Breaking a piece of chalk, Burning a piece of paper, Cutting a piece of paper.

Q. Assertion :The burning of a candle is both a physical and a chemical change. Reason: Burning of candle melts the wax and hence physical state of wax has changed from solid to liquid. Again the wax combines with the atmosphere oxygen and changes to carbon dioxide, heat and light.

We observe that some portion of wax (in candle) melts and other portion of it is used in producing heat and light.
Statement A: The melting of wax is a physical change
Statement B: The burning of wax for the production of heat and light is a chemical change.
State which of the statement(s) is/are true.

Q. When a candle burns, is it possible to get the wax back
(a) after the wax melts?
(b) after the wax burns?
(HINT: Are these phyusical changes or chemical changes?)

Join BYJU'S Learning Program

Which of the following does not involve a chemical reaction ? (a) digestion of food in our body (b) process of respiration (c) burning of candle wax when heated (d) melting of candle wax on heating

Which of the following does not involve a chemical reaction ?

(a) digestion of food in our body

(b) process of respiration

(c) burning of candle wax when heated

(d) melting of candle wax on heating