Question

Matter undergoes a change. The changes are of two types: Physical and chemical change. A physical change is a change that involves only a change in the physical state of matter. Its chemical properties remain the same. Usually increasing the temperature or applying pressure or both bring about a physical change. On reversing the condition, that is reducing the temperature or reducing the pressure or both, the original state of matter is restored. In other words, physical changes are reversible.
A chemical change is a change that involves a change in the chemical composition of matter. A new substance is formed. In a chemical change, new chemical and physical properties of the substance are formed. In a chemical change, the chemical and physical properties of the substance formed will be different from the original substance.
In a chemical change the properties that change are:
A. Chemical only
B. Physical only
C. Both chemical and physical
D. Neither physical nor chemical

Answer 1

Hint: When a chemical change occurs, a completely new product is formed, and the process cant be reversed back too. In a chemical change, properties of the substance change, and also the properties of the matter.

Complete answer:
Let us study physical and chemical changes. Physical changes are changes that affect the shape of a chemical substance, but don't affect its chemical composition. Physical changes are wont to separate mixtures into their component compounds, but cannot usually be wont to get into the molecular/atomic level and separate compounds into chemical elements.
Physical changes occur when objects or substances undergo a sort of change that doesn't change their composition chemically. This contrasts with the concept of the chemical process within which the composition of a substance changes or one or more substances combine or cut to create new substances. Generally, a natural action is reversible using physical means, like mechanical force or pressure. For instance, salt dissolved in water is often reversed by allowing the water to evaporate.
An activity is absolute to involve a change within the physical properties. An example of a phase transition is that the process of forming a blade by tempering steel. A steel blank is repeatedly heated and hammered which changes the hardness of the steel, its flexibility and its ability to take care of a pointy edge, so on application of force and energy, the form is modified
Many physical changes also involve the rearrangement of atoms which are mostly noticed during crystal formation. Many chemical changes are irreversible, and lots of physical changes are reversible, but reversibility can not be classified as a criteria to differentiate. Although chemical changes could also be recognized by a sign like odor, color change, or production of a gas, all of those indicators may end up from phase transition. So, both physical and chemical properties get changed, during a chemical change as a completely new product is formed which has no relation with the original reactant.

Note:
There is an example where physical and chemical change takes place simultaneously. During the burning of a candle, the melting of wax is a physical change. Whereas, the part of the wax close to the flame actually burns and gives light and carbon dioxide, which is irreversible and a chemical change.