How does the shielding effect of d-electrons compare to that of other electrons?

1. Weaker than s-electrons.
2. Stronger than s-electrons.  
3. Same as s-electrons.
4. Same as p-electrons.

The electronegativity of elements from group 1 to group 17 :

1. Decreases

2. Increases

3. Remains constant

4. All 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 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 

Z_eff of Na⁺ and Na⁰ are respectively-

1. 1.95 and 1.22

2. 0.85 and 0.35

3. 1 and 0.35

4. 6.85 and 2.2

Ionic radii vary with respect to the following factors:

a. Inversely proportional to the effective nuclear charge.
b. Directly proportion to the effective nuclear charge.
c. Directly proportional to the screening effect.
d. Inversely proportional to the screening effect.
Which of the following pairs of statements is/are correct?
1. a, c
2. c, d
3. a, b
4. c, d

The order of screening effect of electrons of s, p, d and f orbitals of a given shell of an atom on electrons in its outer shell is :

1. s > p > d > f

2. f > d > p > s

3. p < d < f < s

4. f > p > s > d