Assertion :Covalent bonds must be broken for a liquid to boil
Reason: Heat is released when a liquid changes into a gas

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
Strong chemical bonds are the intramolecular forces which hold atoms together in molecules. A strong chemical bond is formed from the transfer or sharing of electrons between atomic centers and relies on the electrostatic attraction between the protons in nuclei and the electrons in the orbitals.
Molecular substances tend to be gases, liquids or low melting point solids, because the intermolecular forces of attraction are comparatively weak. You don't have to break any covalent bonds in order to melt or boil a molecular substance. Heat is absorbed when a liquid changes into a gas.

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Assertion :Covalent bonds must be broken for a liquid to boil Reason: Heat is released when a liquid changes into a gas

Assertion :Covalent bonds must be broken for a liquid to boil
Reason: Heat is released when a liquid changes into a gas