You are currently viewing Previous Year Chemistry NEET Questions Classification of Elements and Periodicity in Properties

Previous Year Chemistry NEET Questions Classification of Elements and Periodicity in Properties

1. Identify the incorrect match. Name IUPAC Official Name      (NEET 2020)

(A) Unnilunium    (i) Mendelevium

(B) Unniltrium     (ii) Lawrencium

(C) Unnilhexium (iii) Seaborgium

(D) Unununnium (iv) Darmstadtium

(a) (A), (i)           (b) (B), (ii)

(c) (C), (iii)         (d) (D), (iv)

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2. The element Z = 114 has been discovered recently. It will belong to which of the following family/group and electronic configuration?                 (NEET 2017)

(a) Carbon family, [Rn] 5f 14 6d10 7s2 7p2

(b) Oxygen family, [Rn] 5f 14 6d10 7s27p4

(c) Nitrogen family, [Rn] 5f14 6d10 7s2 7p6

(d) Halogen family, [Rn] 5f 14 6d10 7s2 7p5


7. For the second period elements the correct increasing order of first ionization enthalpy is                                                                                       (NEET 2019)

(a) Li < Be < B < C < O < N < F < Ne

(b) Li < Be < B < C < N < O < F < Ne

(c) Li < B < Be < C < O < N < F < Ne

(d) Li < B < Be < C < N < O < F < Ne

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8. Match the oxide given in column I with its property given in column II.

Column I          Column II

(i) Na2O            A. Neutral

(ii) Al2O3          B. Basic

(i ii)N2O            C. Acidic

(iv)Cl2O7         D. Amphoteric

Which of the following options has all correct pairs?                  (NEET 2019)

(a) (I)-B, (ii)-A, (iii)-D, (IV)-C

(b) (I)-C, (ii)-B, (iii)-A, (IV)-D

(c) (I)-A, (ii)-D, (iii)-B, (IV)-C

(d) (I)-B, (ii)-D, (iii)-A, (IV)-C

9. Which of the following oxides is most acidic in nature?          (NEET 2018)

(a) MgO        (b) BeO

(c) BaO         (d) CaO


10. In which of the following options the order of arrangement does not agree with the variation of property indicated against it?                                 (NEET 2016)

(a) I < Br < Cl < F (increasing electron gain enthalpy)

(b) Li < Na < K < Rb (increasing metallic radius)

(c) Al3+ < Mg2+ < Na+ < F(increasing ionic size)

(d) B < C < N < O (increasing first ionization enthalpy)    (a,d)

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11.

        (2015)

(a) O ion has comparatively smaller size than oxygen atom

(b) Oxygen is more electronegative

(c) Addition of electron in oxygen results in larger size of the ion

(d) Electron repulsion outweighs the stability gained by achieving noble gas
configuration.


12. Which of the following orders of ionic radii is correctly represented? (2014)

(a) H> H+ > H            (b) Na+ > F> O2–

(c) F > O2 > Na+      (d) All are wrong

13. Which one of the following arrangements represents the correct order of least negative to most negative electron gain enthalpy for C, Ca, Al, F and O? (2013)

(a) Al < Ca < O < C < F

(b) Al < O < C < Ca < F

(c) C < F < O < Al < Ca

(d) Ca < Al < C < O < F

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14. In which of the following arrangements the given sequence is not strictly according to the property indicated against it?                            (2012)

(a) HF < HCl < HBr < HI : increasing acidic strength

(b) H2O < H2S < H2Se < H2Te : increasing pKa values

(c) NH3 < PH3 < AsH3 < SbH3 : increasing acidic character

(d) CO2 < SiO2 < SnO2 < PbO2 : increasing oxidising power

15. Identify the wrong statement in the following.                                 (2012)

(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.

(c) Atomic radius of the elements increases as one moves down the first group of the periodic table.

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


16. What is the value of electron gain enthalpy of Na+ if IE1 of Na = 5.1 eV? (Mains 2011)

(a) –5.1 eV                      (b) –10.2 eV

(c) +2.55 eV                    (d) +10.2 eV

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17. Which of the following oxides is amphoteric?             (2011)

(a) SnO2       (b) CaO

(c) SiO2       (d) CO2

18. The correct order of the decreasing ionic radii among the following isoelectronic species is                                                       (2010)

(a) Ca2+ > K+ > S2– > Cl

(b) Cl > S2– > Ca2+ > K+

(c) S2– > Cl > K+ > Ca2+

(d) K+ > Ca2+ > Cl > S2–

19. Which of the following represents the correct orderof increasing electron gain enthalpy with negativesign for the elements O, S, F and Cl?            (2010, 2005)

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

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

20. Among the elements Ca, Mg, P and Cl, the order of increasing atomic radii is (2010)

(a) Mg < Ca < Cl < P      (b) Cl < P < Mg < Ca

(c) P < Cl < Ca < Mg     (d) Ca < Mg < P < Cl


21. Among the following which one has the highest cation to anion size ratio? (2010)

(a) CsI             (b) CsF

(c) LiF             (d) NaF

22. Amongst the elements with following electronic configurations, which one of them may have the highest ionisation energy?                            (2009)

(a) Ne [3s2 3p2]      (b) Ar [3d10 4s2 4p3]

(c) Ne [3s2 3p1]      (d) Ne [3s2 3p3]

23. Identify the correct order of the size of the following.                               (2007)

(a) Ca2+ < K+ < Ar < Cl < S2–

(b) Ar < Ca2+ < K+ < Cl < S2–

(c) Ca2+ < Ar < K+ < Cl < S2–

(d) Ca2+ < K+ < Ar < S2– < Cl

24. With which of the following electronic configuration an atom has the lowest ionisation enthalpy?                                                                    (2007)

(a) 1s2 2s2 2p3       (b) 1s2 2s2 2p5 3s1

(c) 1s2 2s2 2p6      (d) 1s2 2s2 2p5

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25. Which one of the following ionic species has the greatest proton affinity to form stable compound?                                                         (2007)

(a) NH2      (b) F

(c) I            (d) HS

26. Which of the following is the most basic oxide?                              (2006)

(a) SeO2         (b) Al2O3

(c) Sb2O3       (d) Bi2O3