Question

Which of the following is a physical change?
a) Hammering of a red hot iron rod to make a flat sheet.
b) Formation of ice by cooling of water.
c) Rising up of water vapors from the sea to make clouds.
d) Heating of charcoal in air to high temperature till it begins to flow.
A. a, b, and c
B. b, c, and d
C. c, d, and a
D. d, a, and b

Answer 1

Hint: In physical change, the physical properties are changed. Whereas, in chemical change, the chemical properties of a matter are changed.

Complete answer:
Properties including form, size, colour and condition of a material are considered physical properties. A change of physical properties in the physical properties of a material is called physical change. In addition, a physical transition is reversible. No new material is produced in such a transition.
A transition that includes the creation of one or more new compounds is considered a chemical change. A chemical change is referred to as a chemical reaction, too. Chemical changes in our lives are very significant. As a result of chemical modifications, all new compounds are created. For example, if a metal needs to be removed from an ore, for example iron, then a number of chemical modifications must be carried out.
Hammering of a red-hot iron rod to make a flat sheet, formation of ice by cooling of water and rising up of water vapors from sea to make clouds are the example of physical changes where the form, size, colour and condition of a material was changed. Heating of charcoal in air to high temperature till it begins to flow is an example of chemical changes.

Hence, the correct answer is option (A)

Note: A chemical change is referred to as a chemical reaction where new compounds may be produced. Properties including form, size, colour and condition of a material are considered physical properties. A change of physical properties in the physical properties of a material is called physical change.