Which of the following statements is correct A) Chemical changes are usually irreversible B) In a Physical change, there is always change in state?

A is true and B is false
A is false and B is true
Both A and B are true
Both A and B are false

LohaHridoy

4 views

2025-01-04 04:42

1 Answers

AhmedNazir

Option 1 : A is true and B is false

Explanation:-

Physical changes:

The changes that occur in a compound without changing its chemical composition is called physical changes.
Physical changes can be reversed.
They occur by the change of state of matter.
Some of the physical changes occur by heating or cooling the substance.
No new product is formed in physical changes.

Chemical changes:

The changes in a substance or compound which brings changes in the chemical composition is called chemical changes.
Chemical changes cannot be reversed.
New substances are formed in chemical changes.
Chemical changes can be endothermic or exothermic.
Chemical changes either absorb energy or release energy.

Reversible changes:-

The changes that can be reversed are called reversible changes.
They are represented by forwarding and backward reactions.
Example - A + B ⇔ C + D

Irreversible changes:-

The changes that can not be reversed are called irreversible changes.
They are only forward reactions.
Example- A + B → C + D

4 views Answered 2022-09-04 04:29

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