An atom of the element A has 3 electrons in its outermost shell while another atom X has 6 electrons in its outermost shell. The formula of the compound between A and X could be.

1. A₂X₃

2. AX₃

3. A₃X₂

4. A₂X

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 screening effect of d-electrons is :

1. Equal of the p-electrons

2. Much more than p-electrons

3. Same as f-electron

4. Less than p-electrons 

Values of electronegativity like 3.0, 2.8, 2.5 are related to :-

(1) Elements having low IP in the periodic table

(2) Elements having high EA in the periodic table

(3) Chalcogens

(4) None of the above

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.

In scandium series, maximum distance between neutrons containing site and valence shell is of :-

1. Sc

2. Mn

3. Fe

4. Zn

Which of the following ionisation energy order is NOT correct :-

(1) Cu⁺ > Cu⁺²

(2) Mn⁺² > Mn⁺³

(3) ${\mathrm{N}}^{+}$< ${\mathrm{N}}^{}$

(4) All of the above

Which of the following would not proceed in the forward direction spontaneously?

1. ${\mathrm{Si}}^{+}+\mathrm{Cl}\to \mathrm{Si}+{\mathrm{Cl}}^{+}$

2. $\mathrm{F}+{\mathrm{I}}^{-}\to {\mathrm{F}}^{-}+\mathrm{I}$

3. Both

4. None

Increasing order of ionic radii and decreasing order of number of protons of the given isoelectronic 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