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Quiz 3
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Q.1
Which of the following has the smallest size? [ CBSE PMT 1996]
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a) Na+
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b) Mg2+
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c) Cl-
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d) F-
Explanation
Na+,Mg2+, F- are isoelectronic ions. Amongst isolectronic ions, the ion with the highest positive charge has the smallest size i.e. Mg2+Answer: (b)
Q.2
Which of the following species has lowest ionization potential? [ Haryana CEET 1996]
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a) O
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b) O2
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c) O2+
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d) O2-
Explanation
Answer: (c)
Q.3
Which of the following elements does not belong to first transition series? [ MP PMT 1995]
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a) Fe
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b) V
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c) Ag
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d) Cu
Explanation
Answer: (c)
Q.4
In the periodic table, on moving along a period, the ionization potential? [ CPMT 1989]
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a) Increases from left to right
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b) Remains unchanged
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c) First increases and then decreases
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d) Decreases from left to right
Explanation
Answer: (a)
Q.5
Ionization potential is lower for .. [ CPMT 1989]
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a) Halogens
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b) Inert gases
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c) Alkaline earth metals
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d) Alkali metals
Explanation
Answer: (d)
Q.6
One of the following has greatest electron affinity. identify it. [ BHU 1994]
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a) F
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b) Cl
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c) I
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d) Br
Explanation
Answer: (b)
Q.7
Two which block is related an element having electronic configuration 1s22s22p63s23p63d104s1 [ MP PMT 1995]
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a) s -block
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b) p - block
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c) d -block
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d) f- block
Explanation
Answer: (c)
Q.8
A transition element X has the configuration [Ar]d4 in its +3 oxidation state. Its atomic number is .. [ CBSE PMT 1996]
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a) 25
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b) 26
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c) 22
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d) 19
Explanation
+3 oxidation state configuration is given as [Ar]d4 Thus neutral metal x has configuration[Ar]d54s2Atomic number=18+5+2=25Answer: (a)
Q.9
The property of attracting electrons by the halogen atoms in a molecules is called.. [ CPMT 1996]
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a) Ionization potential
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b) Electron affinity
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c) Electronegativity
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d) Electronic attraction
Explanation
Answer: (c)
Q.10
Alkali metals in each period have? [ MP PMT 1995]
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a) Smallest size
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b) Lowest ionization potential
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c) Highest ionization potential
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d) Highest electronegativity
Explanation
Answer: (b)
Q.11
Electronegativity is a measure of capacity of an atom to ... [ CPMT 1989]
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a) Attract electrons
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b) Attract protons
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c) Repel electrons
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d) Repel protons
Explanation
Answer: (a)
Q.12
For any given element, the second ionization potential will be ... the first ionization potential? [ Bihar CEE 1995]
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a) Less than
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b) Higher than
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c) same
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d) none of these
Explanation
Answer: (b)
Q.13
Which one of the following is correct order of increase of size .. [ IIT 1990]
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a) Mg
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b) Na+ < Al < Mg < F-
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c) Na+ < F- < Al < Mg
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d) Na+ < F- < Mg < Al
Explanation
Na+ and F- are isoelectronic, cation is smaller in size thus Na+ < F- Na+ is lowest while F- have highest sizeAl with higher nuclear charge has lower size than MgAnswer: (b)
Q.14
Variable valency is generally exhibited by .. [ DOPMT 1984]
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a) Representative elements
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b) Transition elements
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c) Non-metallic elements
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d) Metallic elements
Explanation
Answer: (b)
Q.15
Arrange in the increasing order atomic radii of following elements O, C, F, Cl, Br .. [ AFMC 1994]
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a) F, O, C, Cl, Br
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b) F, C, O, Cl, Br
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c) F, C, Br, O, C
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d) C, O, F, Cl, Br
Explanation
The atomic radii of C, O, F which lie in the second period increases in the order : F, O, C. Further the atomic radii of F, Cl, Br which lie in same group increases in order F, Cl, Br, Thus overall increasing order F, O, C, Cl, Br Answer: (a)
Q.16
The hydride ion is isoelectronic with .. [ AFMC 1995]
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a) Li
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b) He+
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c) He
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d) Be
Explanation
Hydride ion H- configuration 1s2 He configuration 1s2Answer: (c)
Q.17
In the following four elements, the ionization potential of which one is the highest .. [ BHU 1994]
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a) Argon
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b) Barium
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c) Cesium
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d) Oxygen
Explanation
Argon is noble gas, Answer: (a)
Q.18
Of the following elements, which one has the highest electronegativity .. [ CPMT 1989]
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a) Li
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b) Cr
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c) At
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d) F
Explanation
Answer: (d)
Q.19
In which of the following groups when He is placed, its all the properties are satisfied? .. [ Hariyana CEET 2000]
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a) With alkali metals
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b) With halogens
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c) With inert gases
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d) None of these
Explanation
Answer: (c)
Q.20
Which of the order for ionization energy is correct? [ CPMT 1999]
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a) Be < B < C < N < O
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b) B < Be < C < O < N
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c) Be > B > C > N > O
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d) B < Be < N < C < O
Explanation
Be (2s2 ) and N (2s2 2p3 ) have completely filled and half filled more stable electronic configurations and thus their IE is more than B and O respectively Answer: (b)
Q.21
Which of the following have least electron affinity? [ AFMC 2000]
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a) Oxygen
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b) Argon
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c) Nitrogen
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d) Boron
Explanation
Answer: (b)
Q.22
Electron configuration of most electronegative element is ... [ BHU 2000]
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a) 1s2 2s2 2p4 3s1
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b) 1s2 2s2 2p6 3s2 3p5
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c) 1s2 2s2 2p5
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d) 1s2 2s2 2p6 3s2 3p6
Explanation
Most electronegative F (at. no 9) option (c) Answer: (c)
Q.23
Which of the following is not paramagnetic? [ CBSE PMT 1998][At.No. of Be=4, Ne=10, As=33 , Cl=17]
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a) Cl-
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b) Be-
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c) Ne2+
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d) As+
Explanation
Cl- has 2, 8, 8 electron configuration dont have unpaired electron Answer: (a)
Q.24
The element with highest electron affinity among halogens is .. [ AFMC 2001]
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a) F
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b) Cl
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c) Br
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d) I
Explanation
Answer: (b)
Q.25
Which of the following is the smallest cation? [ MP PMT 2000]
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a) Na+
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b) Mg2+
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c) Ca2+
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d) Al3+
Explanation
Ca belongs to Fourth period hence highest size, while rest of the cations belong to third period, as Al has more nuclear charge thus smallest Answer: (d)
Q.26
Which one of the following is correct order of the size of iodine species? [ CBSE PMT 1997]
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a) I > I- > I+
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b) I > I+ > I-
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c) I+ > I- > I
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d) I- > I > I+
Explanation
Size of cation is always smaller and size of anion is always larger than the parent atom Answer: (d)
Q.27
Which of the following pairs of atomic numbers represents elements belonging to the same group? [ Manipal PMT 2001]
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a) 11 and 20
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b) 12 and 30
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c) 13 and 31
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d) 14 and 33
Explanation
Answer: (c)
Q.28
The correct order of ionization energies is ... [ kerala CEE 2000]
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a) Zn < Cd < Hg
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b) Hg < Zn < Cd
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c) Ar > Ne > He
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d) Cs < Rb < Na
Explanation
Factors Affecting Ionisation Energy 1. Size of the positive nuclear charge , more is the nuclear charge, more isonization energy 2.Size of atom, more is the size of atoms/ions lower isonization energy 3. Screening (shielding) effect of inner shell electrons: As shielding increases, the attraction of the positive nucleus for the negative electron decreases and less energy is required to remove an electron. ionisation energy decreases. I.E. decreases from top to bottom in group Optiion (d) elements belong to group I, Na have heighest ionzation energy Answer: (d)
Q.29
Which one of the following is an incorrect statement? [ MP PMT 2001]
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a) The ionization potential of nitrogen is greater than that of oxygen
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b) The electron affinity of fluorine is greater than that of chlorine
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c) The ionization potential of beryllium is greater than that of boron
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d) The electronegativity of fluorine is greater than that of chlorine
Explanation
Electron affinity is lower than chlorine Answer: (b)
Q.30
Consider the following statementsI. The radius of an anion is larger than that of the parent atomII. The ionization energy generally increases with increasing atomic number in period.III. The electro negativity of an element is the tendency of an isolated atom to attract an electron.Which of the above statements is/are correct? ... [ SCRA 2001]
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a) I alone
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b) II alone
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c) I and II
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d) II and III
Explanation
Size of anion is larger than the corresponding atom and the ionization energy generally increases as the size decreases with increasing atomic number in a period Answer: (c)
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