Chemistry
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.
Answer
Both A and R are true but R is not the correct explanation of A.
Reason — A is true as in a chemical change, the original substance changes into new substances with different properties.
R is true as when a cracker bursts, new substances (gases, smoke) are formed with heat, light, and sound.
Therefore, Both A and R are true but R is not the correct explanation of A is the correct option.
Related Questions
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.
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 - Heating of iron with sulphur is a physical change.
Reason - A new substance, iron sulphide is formed, when iron and sulphur are heated together.
- 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.
Fill in the blanks
(a) A new substance is always formed in a …………… change.
(b) Melting of ice is a …………… change.
(c) When a candle burns, wax melts. Melting of wax is a …………… change.
(d) Chemical change occurs as a result of …………… between two substances.
(e) Burning of a fuel is a …………… change.
(f) Revolution of the earth around the sun is a …………… change.
(g) Growing of a seedling into a plant is a …………… change.