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3. Classification of elements and periodicity in properties — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry3. Classification of elements and periodicity in properties1 Mark
MCQ
The incorrect statement is
  • A
    The second ionisation energy of $Se$ is greater than that of second ionisation  energy of $As$
  • B
    The first ionisation energy of $C^{2+}$ ion is greater than that of first ionisation  energy of $N^{2+}$ ­ion
  • C
    The third ionisation energy of, $F$ is greater than that of third ionisation energy of $O$
  • ✓
    Helogens have highest $I.E.$ in respective period
✓

Answer

Correct option: D.
Helogens have highest $I.E.$ in respective period
d
$(a)\,\mathop {Se}\limits_{4{p^4}} \xrightarrow{{I.E{._1}}}\mathop {S{e^ + }}\limits_{4{p^3}} \xrightarrow{{I.E{._2}}}\mathop {S{e^{2 + }}}\limits_{4{p^2}} $   $\mathop {As}\limits_{4{p^3}} \xrightarrow{{I.E{._1}}}\mathop {A{s^ + }}\limits_{4{p^2}} \xrightarrow{{I.E{._2}}}\mathop {A{s^{2 + }}}\limits_{4{p^1}} $

$(b)\,\mathop C\limits_{2{p^2}}  \to \mathop {{C^ + }}\limits_{2{p^1}}  \to C_{2{s^2}}^{2 + }$   $\mathop N\limits_{2{p^3}}  \to \mathop {{N^ + }}\limits_{2{p^2}}  \to \mathop {{N^{2 + }}}\limits_{2{p^1}} $   $\mathop O\limits_{2{p^4}}  \to \mathop {{O^ + }}\limits_{2{p^3}}  \to \mathop {{O^{2 + }}}\limits_{2{p^2}} $

$(c)\,\mathop F\limits_{2{p^5}} \xrightarrow{{I.E{._1}}}\mathop {{F^ + }}\limits_{2{p^4}} \xrightarrow{{I.E{._2}}}\mathop {{F^{2 + }}}\limits_{2{p^3}} \xrightarrow{{I.E{._3}}}{F^{3 + }}$   $\mathop O\limits_{2{p^4}} \xrightarrow{{I.E{._1}}}\mathop {{O^ + }}\limits_{2{p^3}} \xrightarrow{{I.E{._2}}}\mathop {{O^{2 + }}}\limits_{2{p^2}} \xrightarrow{{I.E{._3}}}{O^{3 + }}$

$(d)$ In respective period, noble gases have highest $I.E.$

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