Identify the incorrect statement from the following:

  • A
    The largest and the smallest species among $Mg$, $Mg^{2+}$, $Al$ and $Al^{3+}$ are $Al$ and $Mg^{2+}$, respectively.
  • B
    The $IUPAC$ name of the element with atomic number $107$ is Unnilseptium.
  • C
    The similarity in behaviour of $Li$ with $Mg$ is referred to as,'diagonal relationship'.
  • D
    The oxidation state and covalency of $Al$ in $[AlCl(H_2O)_5]^{2+}$ are $3$ and $6$ respectively.

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Consider the following orders :-
$(I)$ $Li > Na$ (Reducing nature)
$(II)$ $BF_3 > BCl_3 > BBr_3 > BI_3$ (Rate of hydrolysis)
$(III)$ $B > C > N > O > F$ ($1^{st}$ ionization energy)
$(IV)$ $CCl_4 > SiCl_4$ (Boiling point)
The $CORRECT$ order$(s)$ are :-

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Which of the following statements are correct?
$A.$ The process of the addition of an electron to a neutral gaseous atom is always exothermic.
$B.$ The process of removing an electron from an isolated gaseous atom is always endothermic.
$C.$ The $1^{st}$ ionization energy of boron is less than that of beryllium.
$D.$ The electronegativity of $C$ is $2.5$ in $CH_4$ and $CCl_4$.
$E.$ $Li$ is the most electropositive among elements of group $I$.
Choose the correct answer from the options given below:

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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Which of the following orders is not correct for the given property?

Which of these does not reflect the periodicity of the elements?

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