Chemistry
Assertion (A): The changes which result in the formation of new substances with entirely different composition and properties are called chemical changes.
Reason (R): Chemical changes are permanent and irreversible.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false
- A is false but R is true.
Phy & Chem Changes
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Answer
Both A and R are true and R is the correct explanation of A.
Explanation — The changes which result in the formation of new substances with entirely different composition and properties are called chemical changes. Since an entirely new substance is formed, these changes are permanent and irreversible.
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Related Questions
Which of the following is a physical change?
- Cooking of food
- Formation of curd
- A glass cut into pieces
- Boiling of eggs
In a chemical change :
- a new substance is formed
- energy is either released or absorbed
- the change is irreversible
- all of the above
Assertion (A): When a change in a substance can be reversed by changing the conditions, it is said to be a reversible and temporary change.
Reason (R): Burning a piece of paper is a reversible change.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false
- A is false but R is true.
Assertion (A): Sublimation of camphor is a physical change.
Reason (R): No new substance is formed.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false
- A is false but R is true.