Consider the following information about element P and Q :

                        Period number            Group number

P                               2                                 15

Q                               3                                 2

Then formula of the compound formed by P and Q element is :

(a) PQ          (b) P3Q2            (c) P2Q3            (d)PQ2

Concept Questions :-

Nature of Compound
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Which electronic configuration must represent an atom in excited state?

(a) 1s2,2s22p1                                  (b) 1s2,2s22p2(c) 1s2,2s22p2,3s1                          (d) 1s2,2s22p5

Concept Questions :-

Electronic Configuration
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Incorrect order of radius is :

(a) Sr2+ <Rb+<Br <Se2-                   (b) Co>Ni>Cu>Zn

(c)  Co>Co2+>Co3+>Co4+                   (d) As3->Se2->Cs+>Ba2+

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The correct order of atomic/ionic radii is:

(a) Sc>Ti>V>Cr                                 (b) Co>Ni>Cu>Zn                                      

(c) S2->Cl->O2>N3-                         (d) None of these

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The radius of which ion is closest to that of Li+ ion?

1. Na+                                        2. Be2+

3. Mg2+                                       4. Al3+

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The correct order of IE2 is:

(a) Na>F>O>N                      (b) O>F>Ne>N
(c) Ne>O>F>N                      (d) O>Ne>F>N

Concept Questions :-

Ionization Energy (IE)
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Which of the following transformation least energy is required?

(a) F-g  Fg +e-                  (b) P-gPg+e-

(c) S-gSg+e-                    (d) Cl-gClg+e-

Concept Questions :-

Electron Affinity (EA)
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Which of the following represents correct order of electron affinity?

(a) Cl>F>S>O                            (b) F>O>S>Cl

(c) F>Cl>S>O                            (d) Cl>S>O>F

Concept Questions :-

Electron Affinity (EA)
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Correct expression of "Allred and Rochow's" scale is:

(a) Electronegativity =0.744Zeff.r2+0.359

(b) Electronegativity =0.359r2Zeff.+0.744

(c) Electronegativity =0.359Zeff.r+0.744

(d) Electronegativity =0.359Zeff.r2+0.744

Concept Questions :-

Electronegativity
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The process requiring absorption of energy is:

(a) NN-                       (b) FF-

(c) ClCl-                      (d) HH-

Concept Questions :-

Electron Affinity (EA)
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