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Question
Assertion :Different elements exist in different physical states. However, only gaseous state is taken into consideration for all elements for defining IP or EA. Reason: IP or EA property is measured for atoms and molecules in the gaseous state only, since in a solid or liquid states their energy levels would be changed by contact with other atoms or molecules.
Assertion :Different elements exist in different physical states. However, only gaseous state is taken into consideration for all elements for defining IP or EA. Reason: IP or EA property is measured for atoms and molecules in the gaseous state only, since in a solid or liquid states their energy levels would be changed by contact with other atoms or molecules.
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
In the gaseous state, the internuclear separation is high which results in minimum internuclear forces (attraction or repulsion) between the molecules as they are highly dispersed. Thereby, the ionization potential (IP) and electron affinity (EA) values are a characteristic property of the element and are not affected by other interatomic or intermolecular forces.
Molecular/atomic energy gets lower if attractive force operates and increases upon repulsion between molecules/atoms.
Therefore, both assertion and reason are correct and the reason is the correct explanation. Option A is correct.
In the gaseous state, the internuclear separation is high which results in minimum internuclear forces (attraction or repulsion) between the molecules as they are highly dispersed. Thereby, the ionization potential (IP) and electron affinity (EA) values are a characteristic property of the element and are not affected by other interatomic or intermolecular forces.
Molecular/atomic energy gets lower if attractive force operates and increases upon repulsion between molecules/atoms.
Therefore, both assertion and reason are correct and the reason is the correct explanation. Option A is correct.
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