Chemistry
Assertion - The dissolution of salt in water is a physical change.
Reason - Salt retains its composition and properties in solution.
- 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.
Answer
Both A and R are true and R is the correct explanation of A.
Reason — A is true as when salt dissolves in water, no new substance is formed. The process is reversible (salt can be recovered by evaporation).
R is true as salt does not change chemically. It still remains the same substance in solution.
Therefore, Both A and R are true and R is the correct explanation of A is the correct option.
Related Questions
A pop sound is heard when a lighted match stick is brought near the mouth of a jar. This indicates the release of:
- oxygen gas
- hydrogen gas
- nitrogen gas
- water vapour
When we add water to the following substances, which one will show a chemical change?
- salt
- sugar
- oil
- quick lime
Assertion - Naphthalene balls disappear from the cupboard after sometime.
Reason - Naphthalene balls undergo evaporation.
- 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 - During a chemical change, new substances with entirely different properties are formed.
Reason - Bursting of a cracker is a chemical 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.