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

Concept Questions :-

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Which of has the largest size?

(1) Li+(aq)

(2) Cs+(aq)

(3) Li+(g) 

(4) Cs+(g)

Concept Questions :-

Lattice/Hydration Energy
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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 

Concept Questions :-

Screening Effect
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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

Concept Questions :-

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

(1) Elements having high IP in periodic table

(2) Elements having high EA in periodic table

(3) Chalcogens

(4) None of the above

Concept Questions :-

Electron Affinity (EA)
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According to Gallis, Hanny and Smith 50% ionic character and 50% covalent character in a molecule is related to :-

(1) EN = 1.6 - 2.2

(2) EN =1.7 - 2.2

(3) EN =0.8 - 1.1 

(4) EN =0 - 1.6

Concept Questions :-

Electronegativity
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If Zeff of element having atomic number 11 is 2.2, then Zeff of elements having atomic number 12 and atomic number 20 are respectively :-

(1) 2.85, 3.92

(2) 3.92, 2.85

(3) 2.2, 2.2

(4) None of the above

Concept Questions :-

Screening Effect
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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

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Which of the following compound is isoelectronic with adduct of "Diborane and Ammonia" is :-

(1) Hydrogen peroxide

(2) Diborane (at absolute zero temp.)

(3) First member of alkyne series

(4) Diborance (at 10°C temp)

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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-3 > N

(4) All of the above

Concept Questions :-

Ionization Energy (IE)
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