If period number and group number of any representative element(s) are same then which of the following statement is incorrect regarding such type element(s) in their ground state? (Period number and group number are according to modern form of periodic table)

(a) The possible value of principal quantum number is 2

(b) The possible value of azimuthal quantum number is zero

(c) The possible value of magnetic quantum number is 1

(d) The species could be paramagnetic

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How does the energy gap between successive energy levels in an atom vary from low to high n values?

(a) All energy gaps are the same

(b) The energy gap decreases as n increases

(c) The energy gap increases as n increases 

(d) The enenrgy gap changes unpredictably as n increases

Concept Questions :-

Ionization Energy (IE)
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Which of the following properties of the alkaline earth metals increase from Be to Ba?

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

(a) (i) and (ii)                                 (b) (i) and (iii)

(c) (ii) and (iii)                                (d) (i), (ii) and (iii)

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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+

Concept Questions :-

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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

Concept Questions :-

Ionization Energy (IE)
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Which of the following statements is/are wrong?

(a) van der Waals' radius of iodine is more than its covalent radius

(b) All isoelectronic ions belong to same period of the periodic table

(c) I.E.1 of N is higher than that of O while I.E.2 of O is higher than that of N

(d) The electron affinity N is almost zero while that of P is 74.3 kJ mol-1

Concept Questions :-

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Consider the following conversions:

(i) Og+e-Og-H1                 (ii)Fg+e-Fg- ,H2

(iii) Clg+e-Cl-g ,H3          (iv)Og-+e-Og2- , H4

That according to given information the incorrect statement is:

(a) H3 is more negative than H1 and H2

(b) H1is less negative than H2

(c) H1 ,H2 and H3 are negative whereas H4 is positive

(d) H1 and H3 are negative whereas H2 and H4 are positive

Concept Questions :-

Electron Affinity (EA)
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Aqueous solutions of two compounds M1-O-H and M2-O-H are prepared in two different beakers. If, the electronegativity of M1=3.4 , M2=1.2, O=3.5 and H=2.1, then the nature of two solutions will be respectively:

(a) acidic, basic             (b) acidic, acidic

(c) basic, acidic             (d) basic, basic

Concept Questions :-

Electronegativity
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First three ionisation energies (in kJ/mol) of three representative elements are given below:

Element     IE1                    IE2                   IE3

P               495.8                4562                  6910
Q               737.7               1451                   7733
R               577.5                1817                  2745

Then incorrect option is :

(a) Q: Alkaline earth metal        (b) P: Alkali metals

(c) R: s-block element              (d) They belong to same period

Concept Questions :-

Ionization Energy (IE)
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If the ionization enthalpy and electron gain enthalpy of an element are 275 and 86 kcal mol-1 respectively, then the electronegativity of the element on the Pauling scale is:

(a) 2.8                                      (b) 0.0

(c) 4.0                                      (d) 2.6

Concept Questions :-

Ionization Energy (IE)
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