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Quiz 4
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Q.1
The common features among the species CN-, CO and NO+ are .... [ IIT 2001]
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a) Bond order three and isoelectronic
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b) Bond order three and weak field ligands
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c) Bond order two and π-acceptors
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d) Isoelectronic and weak field ligands
Explanation
Bond order is three for both and are iso electronic Answer: (a)
Q.2
The electronic configuration of elements A, B and C are [He]2s1, [Ne]3s1 and [Ar]4s1 respectively. Which one of the following order is correct for IE1 ( in kJ mol-1) of A, B and C? [ EAMCET 2001]
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a) A > B > C
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b) C > B > A
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c) B > C > A
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d) C > A > B
Explanation
the ionization energy generally decreases on moving top to bottom Answer: (a)
Q.3
The decreasing order of the ionization potential of the following elements is ... [ MP PMT 2001]
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a) Ne > Cl > P > S > Al > Mg
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b) Ne > Cl > P > S > Mg > Al
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c) Ne > Cl > S > P > Mg > Al
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d) Ne > Cl > S > P > Al > Mg
Explanation
Closed shell configuration ( Ne), half filled configuration (P) and completely filled configuration ( Mg) are responsible for higher values of ionization energies Answer: (b)
Q.4
Which has smallest size? [ MP CEE 1999] var acc = document.getElementsByClassName("accordion"); var i; for (i = 0; i < acc.length; i++) { acc[i].addEventListener("click", function() { this.classList.toggle("active"); var panel = this.nextElementSibling; if (panel.style.display === "block") { panel.style.display = "none"; } else { panel.style.display = "block"; } }); }
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a) Na+
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b) Mg2+
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c) Al3+
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d) P5+
Explanation
Closed shell configuration ( Ne), half filled configuration (P) and completely filled configuration ( Mg) are responsible for higher values of ionization energies Answer: (b)
Q.5
Which one of the following has highest ionization potential? [ EAMCET 1998]
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a) Li+
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b) Mg+
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c) Al+
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d) Ne
Explanation
Factors Affecting Ionisation potential 1)The values of ionisation potential of an element decreases as its atomic radius increases. 2)Ionisation potential ∝ Effective nuclear charge (Zeff) 3)Ionisation potential is inversely proportional to shielding or screening effect 4)Stability of half−filled and fully-filled orbitals In the above options, lithium has smallest ionic radius, hence highest ionization potential.Answer: (a)
Q.6
The elements in which 4f orbitals are progressively filled up are called as ... [ MP CEE 1996]
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a) Actinides
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b) Transition elements
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c) Lanthanides
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d) Halogens
Explanation
Answer: (c)
Q.7
Electronic configuration of four neutral atoms is given below. Which of the corresponding element would not be paramagnetic... [ AMU 1997]
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a) 1s2, 2s2, 2p6
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b) 1s2, 2s2, 2p1
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c) 1s2, 2s2, 2p5
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d) 1s2, 2s2, 2p4
Explanation
As configuration (a) contains zero unpaired electrons it would, therefore, not be paramagnetic Answer: (a)
Q.8
Highest electron affinity is shown by .. [ DEC 2000]
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a) O-
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b) F-
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c) Cl2
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d) F2
Explanation
Except O- all other have inert gas electron configuration, and hence almost zero electron affinity Answer: (a)
Q.9
Which of the following isoelectronic ions has the lowest ionization energy? [ Haryana CEET 2001]
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a) K+
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b) Ca2+
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c) Cl-
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d) S2-
Explanation
As the size of S2- amongst the isoelectronic species is largest, its ionization energy will be the lowest Answer: (d)
Q.10
Which of the following sets of atomic numbers belong to that of alkali metal? [ AFMC 2001]
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a) 1, 12, 30, 4, 62
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b) 37, 19, 3, 55
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c) 9, 17, 35, 53
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d) 12, 20, 56, 88
Explanation
Answer: (b)
Q.11
Which of the following is most electronegative? [ CPMT 1999 ]
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a) Lead
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b) Silicon
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c) Carbon
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d) Tin
Explanation
Electronegativity decreases from to bottom in group Answer: (c)
Q.12
The correct order of radii is ... [ IIT 2000 ]
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a) N < Be < B
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b) F- < O2- < N3-
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c) N < Li < K
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d) Fe3+ < Fe2+ < Fe4+
Explanation
Among the isoelectronic species, the size increases as the negative charge increases Answer: (b)
Q.13
Whih of the following does not represent the correct order of the property indicated .. [ CBSE PMT 1997 ]
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a) Sc3+ > Cr3+ > Fe3+ > Mn3+ ( ionic radii )
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b) Sc < Ti < Cr < Mn ( density )
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c) Mn2+ > Ni2+ < Co2+ < Fe2+ ( Ionic radii )
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d) FeO < Cao > MnO > CuO ( Basic nature )
Explanation
Ionic radius Fe3+ < Mn3+ Answer: (a)
Q.14
Gradual addition of electronic shells in the noble gases causes a decrease in their .. [ MP CEE 1998]
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a) Ionization energy
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b) Atomic radius
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c) Boiling point
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d) Density
Explanation
Answer: (a)
Q.15
Which of the following is not a transition metal? .. [ Chd.CET 2000]
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a) Zr
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b) TC
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c) Re
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d) Np
Explanation
Np belong to actinide series Answer: (d)
Q.16
The set representing the correct order of first ionization potential is ... [ IIT 2001]
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a) K > Na > Li
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b) Be > Mg > Ca
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c) B > C > N
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d) Ge > Si > C
Explanation
Answer: (b)
Q.17
The incorrect statement among the following is : ... [ IIT 1997]
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a) The first ionization potential of Al is less than the first ionization potential of Mg
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b) The second ionization potential of Mg is greater than the second ionization potential of Na
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c) The first ionization potential of Na is less than the first ionization potential of Mg
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d) The third ionization potential of Mg is greater than the third ionization potential of Al
Explanation
Na+ have attended octate structure thus second ionization potential of Na is greater than second ionization potential of Mg Na < Mg > Al < Si Answer: (b)
Q.18
The radii of F, F-, O and O2- are in order of ..[ AIIMS 1999]
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a) O2- > F- > F > O
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b) F- >O2- > F > O
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c) O2- > O > F- > F
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d) O2- > F- > O > F
Explanation
Atomic radii decreases on going from left to right in a period. Thus, size of O > F. As O2- and F- are iso electronic O2- > F- Answer: (d)
Q.19
Which of the following does not exhibit the periodicity in properties of the elements? [ MP PMT 2001]
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a) Ionization energy
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b) N/P ratio
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c) Electronegativity
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d) Atomic radius
Explanation
Answer: (b)
Q.20
The one with the largest size is .... [ Pb CET 1997]
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a) Cl
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b) Cl-
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c) Cl+
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d) Cl+3
Explanation
Size of cation is always smaller and size of anion is always larger than the parent atom Answer: (b)
Q.21
Ionic radii of ... [ IIT 1999]
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a) Ti4+ < Mn2+
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b) 35Cl- < 37Cl-
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c) K+ > Cl-
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d) P3+ > P5+
Explanation
P5+ has more effective nuclear charge than P3+ and is smaller in size than P3+ Answer: (d)
Q.22
Which of the following ionic radius would be maximum? [ MP CET 1998]
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a) C4-
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b) N3-
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c) O2-
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d) Mg2+
Explanation
All options have ten electrons, isoelectronic species, anion having more negative charge would be largest Answer: (a)
Q.23
Which of the following have same number of electrons in the outermost orbit? [ AFMC 2000]
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a) Pb, Sb
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b) N, O
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c) As, Bi
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d) P, Ca
Explanation
As, Bi both belongs to group 15, have five electrons in outermost orbit Answer: (c)
Q.24
Set containing isoelectronic species is .. [ CBSE PMT 2000]
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a) C22-, NO+, CN-, O22+
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b) CO, NO, O2, CN
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c) CO2, NO2, O2, N2O5
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d) CO, CO2, NO, NO2
Explanation
Answer: (a)
Q.25
Going from fluorine to chlorine, bromine and iodine, the electronegativity ... [ MP PMT 2000]
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a) Increases
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b) Decreases
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c) First decreases then increases
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d) Changes randomly
Explanation
Answer: (b)
Q.26
The second ionization potential of an element M is the energy required to ... [ JIPMER 1997]
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a) Remove one mole of electrons from one mole of gaseous cations of the elements
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b) Remove one mole of electrons from one mole of gaseous anions
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c) Remove one mole of electrons from one mole of monovalent gaseous cations of the element
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d) Remove two moles of electron from one mole of monovalent gaseous atom
Explanation
It is the energy needed to remove a second electron from each ion in 1 mole of gaseous 1+ ions to give gaseous 2+ ions. Answer: (c)
Q.27
First ionization potential will be maximum for .. [ CPMT 2000]
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a) Uranium
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b) Hydrogen
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c) Lithium
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d) Iron
Explanation
Answer: (b)
Q.28
Going from fluorine to chlorine, bromine and iodine, the electronegativity .. [ MP PMT 2000]
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a) Increases
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b) Decreases
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c) First decreases then increases
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d) Changes randomly
Explanation
Answer: (b)
Q.29
The atomic radius increases as we move down a group because... [ Tamilnadu CET 2001]
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a) Effective nuclear charge increases
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b) Atomic mass increases
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c) Additive electrons are accommodated in new electron level
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d) Atomic number increases
Explanation
Answer: (c)
Q.30
Which of the following is not isoelectronic? [ MP PET 2002]
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a) Na+
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b) Mg2+
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c) O2-
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d) Cl-
Explanation
Answer: (d)
0 h : 0 m : 1 s
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