Chemistry
Assertion (A) — A piece of wood is a hard solid, while that of chalk is a soft solid.
Reason (R) — In solids, the intermolecular forces of attraction are very strong.
- 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.
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Answer
Both A and R are true but R is not the correct explanation of A.
Reason — A is true because wood is a hard solid, while chalk is a soft solid and can be broken easily. R is true because intermolecular forces of attraction are strong in solids. However, R does not explain why wood is hard while chalk is soft; this difference is due to stronger intermolecular attraction in wood than in chalk.
Therefore, Both A and R are true but R is not the correct explanation of A is the correct option.
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Related Questions
Assertion (A) — Most of the liquids have their own shape.
Reason (R) — Liquids can flow from a higher to lower level.
- 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) — Particles of matter are always in random motion.
Reason (R) — Particles of matter possess kinetic energy.
- 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) Air is a matter because it has …………… and …………… and it can be …………… .
(b) The molecules are made up of …………… .
(c) The quantity of matter in an object is called its …………… .
(d) The state of matter with definite volume and definite shape is called …………… .
(e) The substances which can flow are called …………… .
Write whether the following statements are true or false.
(a) Solids can diffuse very fast.
(b) The quantity of matter in an object is called volume.
(c) Atoms combine to form molecules.
(d) Particles of matter can move because they possess kinetic energy.
(e) When a liquid is heated, it solidifies.