The process that requires absorption of energy is:

1. NN-                       

2. FF-

3. ClCl-                     

4. HH-

Subtopic:  Electron Affinity (EA) |
 61%
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Which of the following compound is most acidic?

1. Cl2O7                              2. P4O10

3. SO3                                 4. B2O3

Subtopic:  Nature of Compound |
 86%
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If P and T are second period p-block elements then which of the following graph show correct relation between valence electrons in P2 to T2 (corresponding molecules) and their bond order is :

(a)                                                  

(b) 

(c)                                            

(d) 

Subtopic:  Modern Periodic Table & Periodicity |
 58%
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Consider the following four elements, which are represented according to long form of periodic table.

Here W, Y and Z are left, up and right elements with respect to the element 'X' and 'X' belongs to 16th group and 3rd period.Then according to given information the incorrect statement regarding given elements is:

(1) Maximum electronegativity :Y             

(2) Maximum catenation property :X

(3) Maximum electron affinity :Z               

(4) Y exhibits variable covalency

Subtopic:  Electron Affinity (EA) |
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The ground state electronic configurations of the elements, U,V,W,X,and Y (these symbols do not have any chemical significance) are as follows:

                             U        1s22s22p3
V         1s22s22p63s1
W        1s22s22p63s23p2
X         1s22s22p63s23p63d54s2
Y         1s22s22p63s23p63d104s24p6

Determine which sequence of elements satisfy the following statements :

(i) Element forms a carbonate that is not decomposed by heating

(ii) Element is most likely to form coloured ionic compounds

(iii) Element has a largest atomic radius

(iv) Element forms an only acidic oxide

(1) V W Y U                                   (2) V X Y W

(3) V W Y X                                   (4) V X W U

Subtopic:  Electronic Configuration |
 66%
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Which one will show variable oxidation state?

(I) Kr5s1                                 (II) Rn5f146d17s2
(III)Ar3d104s24p5                    (IV) Ar3d64s2

Subtopic:  Electronic Configuration |
 62%
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In alkaline earth metals, the properties, from the following, that will increase from Be to Ba are-

(i) Atomic radius       
(ii) Ionisation energy       
(iii) Nuclear charge

1. (i) and (ii) 2. (i) and (iii)
3. (ii) and (iii) 4. (i), (ii), and (iii)
Subtopic:  Atomic Size |
 81%
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Incorrect order of ionic size is :

(a)La3+>Gd3+>Eu3+>Lu3+           (b)V2+>V3+>V4+>V5+

(c)Tl+>In+>Sn2+>Sb3+                (d)K+>Sc3+>V5+>Mn7+

Subtopic:  Atomic Size |
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Consider the following changes:

 M(s)M(g)                                                   .....(i)
M(s)M2+(g)+2e-                                    .....(ii)
M(g)M+(g)+e-                                      .....(iiii)
M+(g)M2+(g)+e-                                     ......(iv)
M(g)M2+(g)+2e-                                  ......(v)

The second ionization energy of M could be calculated from the energy values associated with :

(a) 1+3+4                  (b) 2-1+3

(c) 1+5                      (d) 5-3

Subtopic:  Ionization Energy (IE) |
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Incorrect statement among the following is -

1. Van der Waals' radius of iodine is more than its covalent radius

2. All isoelectronic ions belong to the same period of the periodic table

3. I.E1 of N is higher than that of O while I.E2 of O is higher than that of N

4. The electron affinity N is almost zero while that of P is 74.3 kJ mol-1

Subtopic:   Evolution of Periodic Table |
 65%
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