Chemistry
Assertion (A): Conversion of a substance in solid state to its liquid state is called melting.
Reason (R): On heating, the kinetic energy of solid molecules increases.
- 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.
Explanation — The process by which a substance changes from solid to liquid is called melting or fusion. On heating, the kinetic energy of solid molecules increases, causing them to vibrate more. This increase in motion weakens the intermolecular forces of attraction, allowing the molecules to move more freely and thus change into the liquid state.
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Related Questions
Assertion (A): Liquid molecules can move freely and are able to occupy the whole space available to them.
Reason (R): The molecules of liquids have larger intermolecular spaces and weaker intermolecular forces of attraction than those in solids.
- Both A and R are true and R is the correct explanation of A.
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Assertion (A): Naphthalene balls become smaller with the passage of time, as they sublime.
Reason (R): Naphthalene balls sublime, as such solids have stronger intermolecular forces of attraction in comparison to other solids.
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Reason (R): The molecules in solids are closely packed.
- Both A and R are true and R is the correct explanation of A.
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Fill in the blanks:
(a) The change of a solid into a liquid is called …………… .
(b) The process in which a solid directly changes into gas is called …………… .
(c) The change of water vapour into water is called …………… .
(d) The temperature at which a liquid starts changing into its vapour state is …………… .
(e) A gas can be changed into a liquid and then into solid by ............... its pressure and cooling .
(f) LPG cylinders contain cooking gas in ............... state at high pressure.
(g) In a chemical reaction, the total mass of the reactants is ............... to the total mass of the products.