Match the following elements,given as hints to their first,second ionization enthalpies and electron gain enthalpies.
List-$I$List-$II$
$i)$ Most reactive non-metal$A$. $\Delta H_1=419, \Delta H_2=3051, \Delta_{Eg} H=-48$
$ii)$ Most reactive metal$B$. $\Delta H_1=1681, \Delta H_2=3374, \Delta_{Eg} H=-328$
$iii)$ Least reactive element$C$. $\Delta H_1=738, \Delta H_2=1451, \Delta_{Eg} H=-40$
$iv)$ Metal forming binary halide$D$. $\Delta H_1=3272, \Delta H_2=5251, \Delta_{Eg} H=+48$

  • A
    $i-B, ii-A, iii-D, iv-C$
  • B
    $i-A, ii-B, iii-D, iv-C$
  • C
    $i-B, ii-A, iii-C, iv-D$
  • D
    $i-B, ii-D, iii-A, iv-C$

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Given below are two statements:
Statement $I$: The second ionisation enthalpy of $Na$ is larger than the corresponding ionisation enthalpy of $Mg$.
Statement $II$: The ionic radius of $O^{2-}$ is larger than that of $F^{-}$.
In the light of the above statements,choose the correct answer from the options given below.

Based on the provided periodic table segment,identify the incorrect statement.

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The atomic numbers of elements $A, B, C$ and $D$ are $Z-1, Z, Z+1$ and $Z+2$,respectively. If $B$ is a noble gas,choose the correct statements from the following:
$(1)$ $A$ has high electron affinity
$(2)$ $C$ exists in $+2$ oxidation state
$(3)$ $D$ is an alkaline earth metal

Which of the following orders is incorrect?

The electronic configurations of four elements are $:-$
$(I) \ [Xe] 6s^1$
$(II) \ [Xe] 4f^{14} 5d^1 6s^2$
$(III) \ [Ar] 4s^2 4p^5$
$(IV) \ [Ar] 3d^7 4s^2$
Select the incorrect statement about these elements $:-$

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