Atomic radius of Be, O, C, N, B are respectively (in pm) :-

(1) 111, 66, 77, 74, 88

(2) 74, 84, 111, 77, 66

(3) 111, 88, 77, 74, 66

(4) 111, 66, 88, 77, 74

Subtopic:  Atomic Size |
 72%
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Which of the following orders of ionic radii is correctly represented?

(1) H->H>H+

(2) Na+>F->O2-

(3) F->O2->Na+

(4) Al3+>Mg2+>N3-

Subtopic:  Atomic Size |
 90%
From NCERT
NEET - 2014
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Identify the wrong statement in the following:

(1) Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius

(2) Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius

(3) Atomic radius of the elements increases as one moves down the first group of the Periodic Table

(4) Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the Periodic Table

Subtopic:  Atomic Size |
 74%
From NCERT
NEET - 2012
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Which of the following represents the correct order of increasing electron gain enthalpy with negative sign for the elements O, S, F and Cl?

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

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

Subtopic:  Electron Affinity (EA) |
 79%
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An element whose IUPAC name is ununtrium(Uut) belong to:

(1) s-block element                               

(2) p-block element

(3) d-block element                               

(4) Transition element

Subtopic:  Modern Periodic Table & Periodicity |
 70%
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Consider the following electronic configuration of an element (P) :

Xe4f145d16s2

Then correct statement about element 'P' is :

(1) It belongs to 6th period and the 1st group

(2) It belongs to 6th period and the 2nd group

(3) It belongs to 6th period and the 3rd group

(4) none of these 

Subtopic:  Electronic Configuration |
 63%
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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 :

(1) PQ         

(2) P3Q2           

(3) P2Q3           

(4)PQ2

Subtopic:  Nature of Compound |
 74%
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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

(1) (i) and (ii)                                 

(2) (i) and (iii)

(3) (ii) and (iii)                               

(4) (i), (ii) and (iii)

Subtopic:  Atomic Size |
 82%
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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

Subtopic:  Electronegativity |
 65%
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The process requiring the absorption of energy is:

1. FF-

2. HH-

3. ClCl-

4. OO2-

Subtopic:  Electron Affinity (EA) |
 69%
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