Chemistry - Mole Concept Question with Solution | TestHub

ChemistryMole ConceptAtomic mass/Average Atomic Mass/Average Molecular MassMedium2 minPYQ_2001

ChemistryMediumsingle choice

Assertion : Ionisation potential of B (atomic no.5) is less than Be (atomic no. 4). Reason : The first electron released from Be is of $p$ -orbital but that from B is of $s$ -orbital.

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Solution:

Electronic configuration of berylium and boron is given as : $Be (Z = 4) : 1 s^{2}, 2 s^{2} B (Z = 5) : 1 s^{2}, 2 s^{2}, 2 p^{1}$ Ionisation potential of $Be$ is greater than that of boron as first electron released from $B e$ is from $s$ -orbital while it is from $p$ -orbital in boron.

Stream:AIIMSSubject:ChemistryTopic:Mole ConceptSubtopic:Atomic mass/Average Atomic Mass/Average Molecular Mass

⏱ 2mℹ️ Source: PYQ_2001

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