In which of the following options the order of arrangement does not agree with the variation of property indicated against it?

1. B < C < N < O (increasing first ionisation enthalpy)
2. I > Br > F > Cl (increasing electron gain enthalpy)
3. Li < Na < K < Rb (increasing metallic radius)
4. Al³⁺ < Mg²⁺ < Na⁺ <F^- (increasing ionic size)

The species Ar, K⁺ and Ca²⁺ contain the same number of electrons. In which order do their radii increase?

$1. \mathrm{Ar} < {\mathrm{K}}^{+} < {\mathrm{Ca}}^{2+}$
$2. {\mathrm{Ca}}^{2+} < \mathrm{Ar} < {\mathrm{K}}^{+}$
$3. {\mathrm{Ca}}^{2+} < {\mathrm{K}}^{+} < \mathrm{Ar}$
$4. {\mathrm{K}}^{+} <\hspace{0.17em}\mathrm{Ar} < {\mathrm{Ca}}^{2+}$

Which of the following orders of ionic radii is correctly represented?

1. $H^{-}>H^{+}>H$

2. $N{a}^{+}>F^{-}>O^{2-}$

3. $F^{-}>O^{2-}>N{a}^{+}$

4. $N^{3-}>M{g}^{2+}>A{l}^{3+}$

Which of the following statements is incorrect?

Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O, S, F and Cl ?

1. Cl<F<O<S

2. O<S<F<Cl

3. F<S<O<Cl

4. S<O<Cl<F

 An amphoteric hydroxide among the following is : 

1.  $\mathrm{Be}{\left(\mathrm{OH}\right)}_2$

2.  $\mathrm{Sr}{\left(\mathrm{OH}\right)}_2$

3.  $\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$

4.  $\mathrm{Mg}{\left(\mathrm{OH}\right)}_2$

The element having electronic configuration [Kr]4d¹⁰4f¹⁴, 5s²5p⁶, 6s² belongs to:

1. s-block

2. p-block

3. d-block

4. f-block

An element whose IUPAC name is ununtrium (Uut) belongs to:

1. s-block element

2. p-block element

3. d-block element

4. Transition element

Consider the following electronic configuration of an element (P) :

                 [Xe]4f¹⁴5d¹6s² 

Then correct statement about element 'P' is :

1. It belongs to 6th period and 1st group

2. It belongs to 6th period and 2nd group

3. It belongs to 6th period and 3rd group

4. None of the above