Atomic radius of Be, O, C, N, B are respectively (in pm) :-

(1) 111, 66, 77, 74, 88

(2) 74, 84, 111, 77, 66

(3) 111, 88, 77, 74, 66

(4) 111, 66, 88, 77, 74

Allred Rochow's scale is related to:
 

1. Electronegativity, radius, and Z^*

2. Resonance energy of the molecule, ionisation potential and electron affinity.

3. Bond Polarity, diagonal relationship and periodicity.

4. None of the above.

Increasing order of the ionic radii and decreasing order of protons of the given isoelectric species is:-

(1) Ca⁺², K⁺, Cl^-, S^-2

(2)Cl^-, Ca⁺², K⁺, S^-2

(3)S^-2, Cl^-, Ca⁺², K⁺,

(4)None of the above

Match list-I with list II and select the correct answer using codes given below:

1. List-I Ions                                List-II Radius (in pm)

(I) Li⁺                                         (a) 216

(II) Na⁺                                      (b) 195

(III) Br^-                                      (c) 60

(IV) I^-                                        (d) 95

     Codes:

      I   II   III   IV

1.   a   b    d    c

2.   b   c    a    d

3.   c   d    b    a

4.   d   c    b    a 

The electronic configuration of chalcogens in their outermost shell is : 

1. ${\mathrm{ns}}^2{\mathrm{np}}^3$ $$ $$ $$    

2. ${\mathrm{ns}}^2{\mathrm{np}}^4$ $$ $$ $$     

3. ${\mathrm{ns}}^2{\mathrm{np}}^5$           

4. ${\mathrm{ns}}^2{\mathrm{np}}^6$

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

1. H^->H>$H^{+}$

2. Na⁺>F^->O^2-

3. F^->O^2->Na⁺

4. N^3->Mg²⁺<Al³⁺

The correct order of increasing electron gain enthalpy with a negative sign for the elements O, S, F, and Cl is : 

1. Cl < F < S < O                   

2. O < S < F < Cl

3. F < S < O < Cl                   

4. S < O < Cl < F

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

1. s-Block elements                       

2. p-Block elements

3. d-Block elements                              

4. Inner transition elements .

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

$\left[\mathrm{Xe}\right]4{\mathrm{f}}^{14}5{\mathrm{d}}^{1}6{\mathrm{s}}^2$

The correct statement about element 'P' is :

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

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

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

4. None of the above.

Consider the following information about element P and Q :

                        Period number            Group number

P                               2                                 15

Q                               3                                 2

Then formula of the compound formed by P and Q element is :

(1) PQ         

(2) $P_3{Q}_2$           

(3)$Q_3{P}_2$            

(4)$P{Q}_2$