The correct order of second ionisation energies of B, C, N, & O is

1. O > N > C > B

2. O > C > N > B

3. O > B > C > N

4. O > N >B > C

Subtopic:  Ionization Energy (IE) |
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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

Subtopic:   Evolution of Periodic Table |
 52%
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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 

Subtopic:  Screening Effect |
 76%
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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 

Subtopic:  Screening Effect |
 83%
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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

Subtopic:  Electron Affinity (EA) |
 57%
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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.

Subtopic:  Electronegativity |
 67%
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In scandium series, maximum distance between neutrons containing site and valence shell is of :-

1. Sc

2. Mn

3. Fe

4. Zn

Subtopic:  Atomic Size |
 54%
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Which of the following ionisation energy order is NOT correct :-

(1) Cu+ > Cu+2

(2) Mn+2 > Mn+3

(3) N+N

(4) All of the above

Subtopic:  Ionization Energy (IE) |
 62%
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Which of the following would not proceed in the forward direction spontaneously?

1. Si++ClSi+Cl+

2. F+I-F-+I

3. Both

4. None

Subtopic:  Ionization Energy (IE) |
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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

Subtopic:  Atomic Size |
 81%
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