Classification of Elements and Periodicity in Properties – 4
1) The first ionisation energy is smallest for the atom with the electronic configuration
2) In a period, the alkali metals have the
a) Highest ionisation energy
b) Largest atomic radii
c) Highest density
d) Highest electronegativity
3) The lowest ionisation potential in a period is shown by
a) Alkali metals
c) Transition elements
d) Alkaline earth metals
4) An atom with high electronegativity generally has a
a) Tendency to form positive ions
b) High ionisation potential
c) Large atomic size
d) Low electron affinity
5) Which of the following elements has the highest atomic volume ?
6) The elements of IA group give colours to the Bunsen burner flame due to their
a) Low I.P.
b) Low M.P
d) One electron in outermost shell
7) The telluric helix was given by
c) Lothar Meyer
d) De Chancourtois
8) In the periodic table on moving from left to right across a period, the metallic character of an element
c) Increases and then decreases
d) Remains constant
9) Elements of the same vertical group of the periodic table have the
a) Same atomic size
b) Same electronic configuration
c) Same number of electrons in the outermost shell of their atoms
d) Same number of atoms
10) Which of the following has the largest ionic radius ?
11) The number of elements present in period V of the periodic table is
12) The first ionisation energy of lithium is
a) Greater than Be
b) Less than Be
c) Equal to sodium
d) Equal to fluorine
13) The 3d transition series contains elements having atomic numbers from
a) 22 to 30
b) 21 to 30
c) 21 to 31
d) 21 to 29
14) The tenth element in the periodic table resembles
a) The second
b) The fourth
c) The fifth
d) The eighth
15) Which of the following elements have a strong tendency to form anions ?
a) P, S, Cl
b) As, Sb, Bi
c) Fe, Co, Ni
d) Li, Be, B
16) The attempt to classify elements by plotting the atomic weight of elements against their volumes was made by
a) Lothar Meyer
17) Transition metals fit in the periodic table between
a) III and IV group
b) I and III group
c) II and III group
d) I and II group
18) The VIII group of periodic table contains
a) 6 elements
b) 12 elements
c) 3 elements
d) 9 elements
19) In the periodic table, with the increase in atomic number, the metallic character of an element
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 a group
d) Decreases in a period and a group
20) A diagonal relationship is shown by
a) All elements with their diagonally opposite elements
b) All elements of the 3rd and 4th periods
c) Some of the elements of the 2nd and 3rd periods
d) Elements of the d – block
21) The most electropositive element of the first period is
22) In the III Period, the most acidic oxide is formed by
23) Which has the least ionisation potential ?
24) An element M forms ,containing 20% of the metal. The atomic weight of the metal is
25) Which of the following is isoelectronic with the carbon atom ?
26) The number of elements present in the fifth period of the periodic table is
27) Mercury is the only metal which is liquid at 0°C. This is due to
a) A very high ionisation energy and weak metallic bonds
b) A low ionisation potential
c) A high atomic weight
d) A high vapour pressure
28) The most acidic among the following is
29) The element with atomic number 55 belongs to which block of the periodic table
30) In the third group of the periodic table, the maximum I.E. will be of
31) The least electronegative element in the periodic table is
32) Among the pair of elements indicated, which will have similar properties?
b) 11, 20
c) 12, 10
d) 21, 33
33) The element with electronic configuration 3d44s1 is a
c) Transition element
34) The change in Zn ® Zn2+ is accompanied by a decrease in the
a) Number of valence electrons
b) Atomic mass
c) Atomic number
d) Number of shells
35) Which period and group in the long form of the periodic table contains the maximum number of elements?
a) 5th period, II group
b) 6th period, III B group
c) 6th period, II group
d) 1st period, II group
36) In which block does the element with the following electron arrangement exist
37) The electronic configuration of an element is Is22s22p63s23p63dlÂ°4s24p3 . Its properties would be similar to which of the following elements ?
38) What are the most common elements present in the earth’s crust ?
a) Oxygen, Iron, Potassium
b) Silicon, Iron, Magnesium
c) Oxygen, Iron, Silicon
d) Silicon, Aluminium, Oxygen
39) Which of the following statements correctly represents the property of elements related to the increase in atomic number in the carbon family (group IV B) ?
a) Their metallic character decreases
b) The stability of the +2 oxidation state increases
c) Their ionisation energy increases
d) Their atomic size decreases
40) In which group do all the elements not belong to the same block, and all the elements do not have the same number of valence electrons ?
a) Zero group
b) First group
c) Third group
d) Seventh group
41) In which period and which group are all the elements gases ?
a) First period, zero group
b) Third period, zero group
c) Second period, zero group
d) 1st period, second group
42) The element whose electronic configuration is 1s22s22p63s2 is a
c) Inert gas
43) A newly discovered element X is placed in group IA of the periodic table because it forms
a) An oxide which is acidic
b) A volatile chloride having the formula XCl
c) An ionic chloride having the formula XCl
44) The element with the electronic configuration 1s22s22p63s23p63d104s24p64d105s25p3 belongs to the following group of the periodic table
45) In the isoelectronic species, the ionic radii of N3-, O2- and F– are respectively given by
a) 1.36, 1.40, 1.71
b) 1.36, 1.71, 1.40
c) 1.71, 1.40, 1.36
d) 1.71, 1.36, 1.40
46) Which of the following pairs of elements behave as metalloids ?
a) Br and I
b) Pt and I
c) B and Cs
d) Al and Zn
47) The element in the III group and III period in periodic table is
48) The cation which is least stable is
49) Elements of the same group in the periodic table are characterised by the same
a) lonisation potential
c) Electron affinity
d) number of valency electrons
50) Most of the known elements are
c) Transition metals
d) Inner transition metals
51) Which of the following pairs of elements contain the same number of electrons in the outermost orbit ?
a) N, O
b) Na, Cl
c) As, Bi
d) Pb, Sb
52) Which of the following statement is not true about the long form of periodic table ?
a) It reflects the sequence of filling of electrons in order of sub-energy levels s, p, d and f
b) It helps to predict the stable valency states of the elements.
c) It reflects trends in physical and chemical properties of the elements.
d) It helps to predict the relative ionicity of the bond between any two elements.
53) Which of the following has the smallest radius ?
54) The biggest ion is
55) Which of the following pairs of elements belongs to the same period ?
a) Li, Na, K
b) Ca, Cr, Zn
c) Cr, In, Pb
d) H, He, F
56) Among the following group of elements, the one whose elements can have positive as well as negative oxidation states are
a) H, F, O
b) Na, Mg, Al
c) He, Li, Be
d) H, Cl, Br
57) Which of the following periodic table groups consists entirely of metals ?
b) IV A
c) VI A
58) Which has the highest boiling point.
59) The second ionisation potential of K, Ca and Ba (Z : K = 19, Ca = 20,Ba = 56) in decreasing order are
a) K > Ca > Ba
b) Ca > Ba > K
c) Ba > K > Ca
d) K > Ba > Ca
60) Name the block in which metals, metalloids,non-metals and inert gases are all present.
a) s -block
b) p -block
c) d – block
d) f – block
61) Among the following elements, the one having the highest ionisation energy is
62) Which of the following is formed easily ?
63) Which of the following groups may contain a metalloid ?
a) I A
b) II A
c) VI A
64) Which of the following has the least density ?
65) The combination of atoms takes place so that
a) they can gain two electrons in the outermost orbit
b) they can get eight electrons in the outermost orbit
c) they acquire stability by lowering of energy
d) they can get eighteen electrons in the outermost shell.
66) If in forming a compound AB, an electron is transferred from A to B then
a) A is divalent
b) B is oxidised
c) A and B are covalently bonded
d) The compound AB is electrovalent
67) An ionic compound A+B– is most likely to be formed when
a) the ionisation energy of A is high and the electron affinity of B is low
b) the ionisation energy of A is low and the electron affinity of B is high
c) Both the ionization energy of A and the electron affinity of B are high
d) Both the ionization of energy of A and the electron affinity of B are low
68) When an element of very low ionization potential reacts with an element with very high electron affinity, the bond formed will be predominantly
69) Which of the following statements concerning the element with the atomic number 10 is true?
a) It forms a covalent network of solids
b) Its molecules are monoatomic
c) It has a very high electron affinity
d) It has an extremely low value of ionization energy.
70) Which of the following is an ionic compound?
71) Which factor is most responsible for the increase in boiling points of noble gases from He to Xe?
a) the decrease in I.E
b) Monoatomic nature
c) Decrease in polarisability
d) Increase in polarisability
72) Which of the following is a solid with the highest melting point?
73) A metallic bond is
a) similar to an ionic bond
b) similar to a covalent bond
c) similar to neither ionic nor covalent bonds
d) formed by the movement of positively charged spheres in a sea of electrons
74) The following is in the incorrect order of decreasing boiling points:
a) HF >HI > HBr > HCl
75) Alkali metals ( Na, K etc) conduct electricity because
a) They are soft
b) They have only one valence electron
c) they react with water to give H2 gas
d) Their electrons are mobile
76) The first four ionization energy values of an element are 191,578, 872 and 5962 kcal. The number of valence electrons in the element is
77) Which of the following molecules is theoretically not possible?
78) Which of the following is an example of a super-octet molecule?
d) All the three
79) Which of the following statements is incorrect for ?
a) All the P-Cl bond lengths are equal
b) it involves sp3 hybridization
c) It has an irregular geometry
d) Its shape is trigonal bipyramidal
80) In one of the following molecules, the state of hybridisation of the central atom is not the same as in the others. Which one is it?
81) If a metal ion M3 + loses 3 electrons, its oxidation number will be
b) + 6
c) + 3
d) Â– 3
82) Write the oxidation state of phosphorus in H3PO3.
83) In the chemical reaction Cl2 + H2S 2HCl + S, the oxidation number of sulphur changes from
a) 0 to 2
b) 2 to 0
c) -2 to 0
d) -2 to 1
84) The number of neutrons in a parent nucleus X, which gives 7N14 after two successive emissions would be
85) What is X in the following nuclear reaction?
7N14 + 1H1 8O15 + X.
86) The half-life period of a radioactive element is 140 days. In 560 days a sample of this element would be reduced to …. of its initial mass.
87) In terms of energy 1 amu is equal to
a) 100 J
c) 931.1 kcal
88) The half-life period of U is 4.5 x 10 9 years. After how many years will the amount of U be reduced to half its present amount?
89) If 90Th228 disintegrates to 83Bi212, then the number of Â— and Â—particles emitted are respectively
90) The activity of a radioactive nuclide (100X) is 6.203 curie. If its disintegration constant is 3.7x 104 sec-1, the mass of X is
91) Sulphur -35 (34.96903 amu) emits a beta particle but no gamma ray. The product is chlorine-35 (34.96885 amu). The maximum energy emitted by the beta particle is
a) 16.758 MeV
b) 16.6758 MeV
c) 0.16758 MeV
d) 0.016758 MeV
92) On bombarding 7N14 with particles, the nucleus of the product formed after the release of a proton will be
93) The decay constant of a radioactive sample
a) Decreases as the age of atom increases
b) Increases as the age of atom increases
c) is independent of the age
d) Depends on the nature of activity
94) The reaction 5B8 4Be8 + 1e0 takes place due to
c) Positron decay
d) Electron capture
95) The half-life of 4 isotopes are: (I) 6.7 years (II) 8xl03 years (III) 5760 years (IV) 2.35 x l05 years. The most stable isotope is
96) The half-life period of a radioactive substance is 8 years. After 16 years, the mass of the substance will reduce from 16.0 g at the start to
a) 8 g
b) 6 g
c) 4 g
d) 2 g
97) Which element has a relatively stable nucleus?
98) Atoms of different elements having identical masses are known as
99) Which isotope is likely to be most stable?
100) 6027Co is radioactive because
a) Its atomic number is high
b) It has a high N/P ratio
c) It has a low N/P ratio