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

If IUPAC name of an element is "unununium" then correct statement regarding element is:

Which property decreases from left to right across the periodic table and increases from top to bottom?

Choose the correct option:
1. (i) only

2. (i), (ii) and (iii)

3. (i), (iii) and (iv)

4. (i) and (iv)

The first, second and third ionisation energies (E₁, E₂ and E₃) for an element are 7 eV, 12.5 eV and 42.5 eV respectively. The most stable oxidation state of the element will be:

1. +1

2. +4

3. +3

4. +2

The order of ionisation potential between He⁺ ion and H-atom (both species are in gaseous state) is :

1. I.P(He⁺ ) = I.P (H)

2. I.P(He⁺ ) < I.P (H)

3. I.P(He⁺ ) > I.P (H)

4. Cannot be compared

Second ionisation potential of Li, Be and B is in the order:

1. Li > Be > B

2. Li > B > Be

3. Be > Li > B

4. B > Be > Li