Chemistry_Class-11_Chapter-3_Topic-2_EAtomic and Ionic Radii

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1. The radii of F, F, O and O-2 are in the order of

(a) O2-> F- > O > F

(b) O2- > F- > F > O

(d) O2- > O > F- > F

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2. Among the elements Ca, increasing atomic radii is Mg, P and Cl, the order of

(a) Mg < Ca < Cl < P

(b) Cl < P < Mg < Ca

(d) Ca < Mg < P < Cl

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3. Which is the correct order of atomic sizes (At. no. : Ce = 58 Sn = 50 Yb = 70 and Lu = 71 )

(a) Ce > Sn > Yb > Lu

(b) Sn > Ce > Lu > Yb

(d) Sn > Yb > Ce > Lu

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4. Atomic radii of fluorine and neon in angstrom units are respectively given by

(a) 0.762, 1.60

(b) 1.60, 1.60

(d) None of these values

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5. Which is smallest in size

(a) O2-

(b) C4-

(d) N3-

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6. Which one of the following ions has the highest value of ionic radius

(a) O2-

(b) B3+

(d) F-

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7. Which one of the following is the smallest in size

(a) N3-

(b) O2-

(d) Na+

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8. The size of the following species increases in the order

(a) Ma2+ < Na+ < F- < Al

(b) F- < Al Mg2+

(d) Na+ < Al < F- <Mg+

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9. The set representing the correct order of ionic radius is

(a) Li+ > Be2+ > Na+ > Mg2+

(b) Na+ > Li+ > Mg2+ > Be2+

(d) Mg2+ > Be2+ > Li+ > Na+

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10. Which of the following does not represent the correct order of the property indicated

(a) Sc3+ > Cr3+ > Fe3+ > Mn3+ : Ionic radii

(b) Sc < Ti < Cr < Mn : Density

(d) FeO MnO > CuO: Basic nature

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11. Identify the correct order of the size of the following

(a) Ca2+ < K+ < Ar < S2- < Cl-

(b) Ca2+ <K+ < Ar < Cl- <S2-

(d) Ca2+ < Ar <K+ < Cl- < S2-

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12. The correct order of radii is

(a) N < Be < B

(b) F- < O2- < N3-

(d) Fe3+ < Fe2+ < Fe4+

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13. The ionic radii (in A ̇) of N3- , O2- and F- are respectively

(a) 1.36, 1.40 and 1.71

(b) 1.36, 1.71 and 1.40

(d) 1.71, 1.36 and 1.40

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14. Which one of the following is expected to have largest size

(a) F-

(b) O-2

(d) N-3

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15. Ionic radii are

(a) Directly proportional to effective nuclear charge

(b) Directly proportional to square of effective nuclear charge

(d) Inversely proportional to square of effective nuclear charge

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16. Identify the wrong statement in the following

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

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

(d) Atomic radius of the elements decreases as one move across from left to right in the 2 ^ (nd) period of the periodic table

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17. Which of the following orders of ionic radii is correctly represented

(a) F- > O2- > Na+

(b) Al3+ > Mg2+ > N3-

(d) Na+ > F- > O2-

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18. Ionic radii of

(a) Ti4+ < Mn7+

(b) 35Cl- < 37Cl-

(d) P3+ > P5+

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19. Consider the isoelectronic species, Na+, Mg2+, F- and O2- The correct order of increasing length of their radii is

(a) F- < O2- < Mg2+ < Na+

(b) Mg2+ < Na+ < F- < O2-

(d) O2- < F- < Mg2+ < Na+

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20. Which of the following statement concerning lanthanides elements is false

(a) Lanthanides are separated from one another by ion exchange method

(b) lonic radii of trivalent lanthanides steadily increases with increase in the atomic number

(d) More characteristic oxidation state of lanthanide elements is +3

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21. The ionic conductance of following cation in a given concentration are in the order

(a) Li+ < Na+ < K+ < Rb+

(b) Li+ > Na+ > K+ > Rb+

(d) Li+ = Na+ < K+ < Rb+

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22. Increasing order of ionic size for the ions, F, O2- , Na+, Al3+ is

(a) O2- < F- < Na+ < Al3+

(b) Al3+ < Na+ < F- < O2-

(d) Al3+ < F- < Na+ < O2-

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23. Which of the following sets will have highest hydration enthalpy and highest ionic radius

(a) Na and Li

(b) Li and Rb

(d) Cs and Na

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24. The species Ar, K+ and Ca2+ contain the same number of electrons. In which order do their radii increase

(a) Ca2+ < Ar < K+

(b) Ca2+ < K+ < Ar

(d) Ar < K+ < Ca2

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25. Which one is the correct order of the size of the iodine species

(a) I > I+ > I-

(b) I > I- > I+

(d) I- > I > I+

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26. Which statement is correct

(a) For potassium, the atomic radius ionic radius

(b) For potassium and bromine both, the atomic radii > ionic radii

(d) For potassium, the atomic radius > ionic radius but for bromine, the atomic radius < ionic radius

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27. Which of the following ion is the smallest ion

(a) O+2

(b) O-2

(d) O22

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28. Among the following which one has highest cation to anion size ratio

(a) Csl

(b) CsF

(d) NaF

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29. The isoelectronic pair is

(a) CO,N2

(b) O2,NO

(d) F2, HCI

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30. The correct order of the atomic radii of C,Cs, Al and S is:

(a) C < S < Al < Cs

(b) S < C < Al< Cs

(d) C < S < Cs < Al

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