CLO- Classification of Elements & Periodicity in Properties
MULTIPLE CHOICE QUESTIONS:
Choose the one correct option in the following:
1. Identify the least stable ion amongst the following :
(a) Li–
2.
(b) Be–
(c) B–
(d) C–
The correct order of radii is :
(a) N<Be< B
(b) F–<O2–<N3– (c) N< Li<K
(d) Fe3+<Fe2+<Fe4+
3. Which one of the following has largest size :
(a) Na
(b) Na+
(c) Na–
(d) Li+
4. The number of elements in the 4th period of periodic table is :
(a) 8
(b) 10
(c) 18
(d) 32
5. Which of the following has least electron affinity (electron gain enthalpy) :
(a) O
(b) N
(c) Ar
(d) F
6. An element of atomic number 29 belongs to which of the following block of the periodic table :
(a) S–block
(b) P–block
(c) d–block
(d) f–block
7. Which one of the following arrangements not truly represents the property indicated against it:
(a) Br2<Cl2<F2 – electronegativity
(b) Br2 <F2<Cl2 – Electron Affinity
(c) Br2 <Cl2 < F2 – Bond energy
(d) Br2<Cl2<F2 – Oxidising Power
8. Alkali metals in each period have :
(a) Smallest size
(b) Lowest IE
(c) Highest IE
(d) Highest EN
9. A sudden large jump between the value of second and third ionization energies of elements would be
associated with which of the following electronic configuration :
(a) 2P63S1
(b) 3S23P1
(c) 3S23P2
(d) 2P63S2
10. Which of the following pairs are chemically dissimilar :
(a) Na and K
(b) Ba and Sr
(c) Zr and Hf
(d) Ca and Zn
11. Collective name given to the elements with outer shell configuration ns 2np6 is :
(a) Chalcogens
(b) Alkaline earths metals (c) Transition metals (d) Nobel gases
12. Modern extended periodic table was given by :
(a) Bohr
(b) Lother mayer
(c) Moseley
(d) None alone
13. The most electronegative elements is :
(a) Hydrogen
(b) Fluorine
(c) Chlorine
(d) Oxygen
(c) d-block
(d) f-block
14. The element having electronic configuration :
[Kr]4d104f14 5S2 5P6 5d1 6S2 belongs to
(a) S-block
(b) P-block
15. An elements R forms the highest oxide R 2O5 R belong to :
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(a) IV-group
(b) V-group
(c) VI-group
(d)VII-group
16. Consider isoelectronic series : K+, S2–, Cl–, Ca2+ the radii of ions decrease as :
(a) Ca2+ > K+ >Cl– > S2–
(b) Cl–>S2– > K+ > Ca2+
(c) S2– > Cl– > K+ > Ca2+
(d) K+>Ca2+ > S2–>Cl–
17. The IE1, of Al is smaller than that of Mg because :
(a) the atomic size of Al > mg
(b) the atomic size of Al< mg
(c) Al has one unpaired electron in p-orbital
(d) the atomic number of Al > mg
18. The ionic radius of a cation is always :
(a) less than atomic radius
(b) more than atomic radius
(c) equal to atomic radius
(d) can not predicted
19. Eka –aluminium and Eka-silicon are known as :
(a) Gallium and Germanium
(b) Aluminium and silicon
(c) Iron and sulphur
(d) Sodium and silicon
20. The electronic configuration of transition element is exhibited by :
(a) ns1
(b) ns2np5
(c) ns2(n-1)d1-10 (d) (n-1)d1-10 ns0-2
21. The correct order of Ionisation enthalpy of C, N, O, F is :
(a) F<N<C<O
(b) C<N<O<F
(c) C<O<N<F
(d) F<O<N<C
22. Transition metals are characterized by the properties except :
(a) Variable valency
(b) Coloured comp.
(c) High M.P. & B.P.
(d) no tendency to form complex
23. Which one is the correct order of the size of the Iodine species :
(a) I > I+ > I –
(b) I > I0 > I+
(c) I+ > I– >I
(d) I– > I > I+
24. Element X belongs to 4th period. It contain 14 and 2 electron in the penultimate and ultimate orbit. The
element X should be :
(a) Normal element
(b) transition element (c) Inertgas
(d) Inner-Transition element
25. Most of the man-made synthetic elements occurs :
(a) In Actinoid series
(b) In Lanthanoid series
(c) In coinage metals
(d) In Alkaline earth metals
26. Which of the following electronic configuration represents most electropositive elements :
(a) [He]2S1
(b) [He]2S2
(c) [Xe]6S1
(d) [Xe]6S2
27. The symbol of element having Atomic no. 117 is :
(a) Uus
(b) Unh
(c) Uns
(d) NUS
28. The electron affinity values of elements ABCD are respectively –135, –60, –200, –348 Kh mol –1. The outer
electronic configuration of element B is :
(a) 3S23P5
(b) 3S23P4
(c) 3S23P3
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(d) 3S23P2
29. Generally the first Ionisation enthalpy increases along a period but there are some exception. One which is
not an exception is :
(a) N and O
(b) Na and Mg (c) Mg and Al
(d) Be and B
30. The order of screening effect of electrons of S, P, d and f orbitals of a given shell of an atom on its outer
shell electrons is :
(a) S>P>d>f
(d) f > d > p > s (c) P < d < s > f (d) f > P > s > d
ANSWERS:
A. Multiple Choice Questions:
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