Classification Of Elements And Periodicity In Properties PDF

CLASSIFICATION OF 7. Na+, Mg++, Al3+ and Si4+ are isoelectronic. The order of their ionic size is ELEMENTS AND (a) Na+> Mg++< Al3+< Si4+...

CLASSIFICATION OF 7. Na+, Mg++, Al3+ and Si4+ are isoelectronic. The order of their ionic size is ELEMENTS AND (a) Na+> Mg++< Al3+< Si4+ (b) Na+< Mg++> Al3+> Si4+ PERIODICITY IN (c) Na+> Mg++> Al3+> Si4+ PROPERTIES (d) Na+< Mg++> Al3+< Si4+ 8. If the atomic number of an element is 33, it will be placed in the periodic table in the 1. Pauling’s electronegativity values for (a) First group elements are useful in predicting (b) Third group (a) Polarity of the molecules (c) Fifth group (b) Position in the E.M.F. series (d) Seventh group. (c) Coordination numbers 9. In the periodic table from left to right in a (d) Dipole moments. period, the atomic volume 2. The electronic configuration of four elements (a) Decreases are given below. Which elements does not (b) Increases belong to the same family as others? (c) Remains same (a) (d) First decrease then increases 10. Which electronic configuration of an element has abnormally high difference between second (b) and third ionization energy? (a) Is2, 2 s2, 2 p6, 3 s-1 (b) Is2, 2 s2, 2 p6, 3 s13 p1 (c) (c) Is2, 2 s2, 2 p6, 3 s23 p2 (d) Is2, 2 s2, 2 p6, 3 s2 11. One of the characteristic properties of (d) nonmetals is that they (a) Are reducing agents 3. In the periodic table, with the increase in (b) Form basic oxides (c) Form cations by electron gain atomic number, the metallic character of an (d) Are electronegative element 12. (a) Decreases in a period and increases in a group (b) Increases in a period and decreases in a group (c) Increases both in a period and the group (d) Decreases in a period and the group. 4. Elements of which of the following groups will form anions most readily? (a) Oxygen family (b) Nitrogen family (a) 33 (c) Halogens (b) 34 (d) Alkali metals (c) 36 5. Which of the following sets has strongest (d) 49 tendency to form anions? 13. The element, with atomic number 118, will (a) Ga, In, Tl be (b) Na, Mg, Al (a) alkali (c) N, O, F (b) noble gas (d) V, Cr, Mn (c) lanthanide 6. One would expect proton to have very large (d) transition element (a) Charge 14. Which one of the following ions will be the (b) Ionization potential smallest in size? (c) Hydration energy (a) Na+ (d) Radius. (b) Mg2+ (c) F2 (d) O2+ (d) Ca 15. Which of the following does not represent 23. Ionic radii are the correct order of the properties indicated (a) inversely proportional to effective nuclear (a) Ni2+> Cr2+> Fe2+> Mn2+( size) charge (b) Sc > Ti > Cr > Mn (size) (b) inversely proportional to square of effective (c) Mn2+ > Ni2+< Co2+ Co2+> Ni2+> Cu2+( unpaired electron) (c) directly proportional to effective nuclear 16. The first ionization potentials (eV) of Be and charge Brespectively are (d) directly proportional to square of effective (a) 8.29, 9.32 nuclear charge (b) 9.32, 9.32 24. Which one of the following oxides is (c) 8.29, 8.29 expected to exhibit paramagnetic behaviour? (d) 9.32, 8.29 (a) CO2 17. Of the given electronic configurations for (b) SiO2 the elements, which electronic configuration (c) SO2 indicates that there will be abnormally high (d) ClO2 difference in the second and third ionization 25. Which one of the following arrangements energy for the element? represents the correct order of electron gain (a) 1s22 s-22 p63 s2 enthalpy (with negative sign) of the given (b) 1s22 s22 p63 s1 atomic species? (c) 1s22 s22 p63 s33 p1 (a) S< O< Cl < F (d) 1s22 s22 p63 s23 p1 (b) Cl < F< S< O 18. Correct order of first IP among following (c) F< Cl < O< S elements Be, B, C, N, Ois (d) O< S< F< Cl (a) B< Be < C< O< N 26. Identify the correct order of the size of the (b) B< Be < C< N< O following: (c) Be < B< C< N< O (a) Ca2+< K+< Ar < Cl-< S2- (d) Be < B< C< O< N (b) Ar < Ca2+< K+< Cl-< S2- 19. Which of the following order is wrong? (c) Ca2+< Ar < K+< Cl-< S2- (a) NH3 < PH3 < AsH3 – Acidic (d) Ca2+< K+< Ar < S2-< Cl- (b) Li < Be < B< C– First IP 27. Which of the following electronic (c) Al2O3 < MgO< Na2O< K2O– Basic configuration an atom has the lowest ionisation (d) Li+< Na+< K+< Cs+– Ionic radius enthalpy? 20. An atom has electronic configuration 1s22 s2 (a) 1s22 s2sp3 2p63 s23 p63 d34 s2, you will place it in which (b) 1s22 s22 p53 s1 group? (c) 1s22 s22 p6 (a) Fifth (d) 1s22 s22 p5 (b) Fifteenth 28. Which one of the following ionic species has (c) Second the greatest proton affinity to form stable (d) Third compound? 21. Which of the following statements is true? (a) NH2- (a) Silicon exhibits 4 coordination number in its (b) F- compound (c) I- (b) Bond energy of F2 is less than Cl2 (d) HS- (c) Mn(III) oxidation state is more stable than 29. The stability of + 1 oxidation state increases Mn(II) in aqueous state in the sequence: (d) Elements of 15th group shows only +3 and (a) Tl < In < Ga < Al +5 oxidation states (b) In < Tl < Ga < Al 22. Among K, Ca, Fe and Zn the element which (c) Ga < In < Al < Tl can form more than one binary compound with (d) Al < Ga < In < Tl chlorine is 30. Amongst the elements with following (a) Fe electronic configurations, which one of them (b) Zn may have the highest ionization energy? (c) K Solutions : 1. Ans: (a) 2. Ans: (c) 3. Ans: (a) 4. Ans: (c) 5. Ans: (c) 6. 16. Ans: (c) Ans: (d) First ionisation potential of Be is greater 7. than boron due to following configuration Ans: (c) 4Be =1s2 , 2s2 5B = 1s2 , 2s22p1 8. Ans: (c) Order of attraction of electron towards nucleus 2s >2p , so more amount of energy is required to Element with Z = 33 remove the electron with 2s- orbital in comparison (1s2 2s2p6 3s2p6d104s2p3) lies in fifth (or 15th group) to 2p orbital. 9. 17. Ans: (d) Ans: (a) 10. Mg = 1s22s22p63s2 Ans: (d) After removing of 2 electron, the magnesium 11. acquired noble gas configuration hence removing of Ans: (a) 3rd electron will require large amount of energy 12. 18. Ans: (a) Ans: (a) 13. Be – 1s22s2 , B – 1s22s22p1 ,. C – 1s2s22p2 ; N – 1 Ans: (b) Electronic configuration of element with s22s22p3 ; O – 1s22s22p4. IP increases along the atomic number 118 will be [Rn]5f146d10 7s27p6. period. But IP of Be > B. Further IP of O