Periodic TableMedium
Question
Given below are two statements:
Statement (I) : The first ionization enthalpy of the elements $Na,Mg,Cl$ and Ar follows the order
$$Na > Mg > Cl > Ar $$Statement (II) : Among $Ca,Al,Fe$ and B , the third ionisation enthalpy is very high for Ca .
In the light of the above statements, choose the correct answer from the options given below :
Options
A.Both Statement I and Statement II are true
B.Both Statement I and Statement II are false
C.Statement I is true but Statement II is false
D.Statement I is false but Statement II is true
Solution
Sol. [Key Concept: Recall the first-IE trend $Na < Mg < Cl < Ar$ and the very high 3rd IE of Ca (noble-gas core).]
(i) $Na < Mg < Cl < Ar \rightarrow I^{\text{st}\text{~}}$ ionization energy
(ii) Among B, Ca, Al, Fe
Ca has maximum $3^{\text{rd}\text{~}}$ ionization energy among given due to inert gas configuration.
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