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NEET Chemistry MCQ
Periodic Table Mcq Neet Chemistry
Quiz 2
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Q.1
Which is chemically most active non-metal? [ BHU 1982]
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a) F2
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b) He
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c) N2
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d) O2
Explanation
Answer: (a)
Q.2
In the long form of periodic table all the non-metals are placed in ... [ EAMCET 1988]
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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: (b)
Q.3
Which has the largest first ionization energy? [ Pb. PMT 1986]
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a) Li
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b) Na
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c) K
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d) Rb
Explanation
Answer: (a)
Q.4
Which of the following pair has both members from the same group of periodic table? [ CPMT 1985]
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a) Mg, Ba
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b) Mg, Na
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c) Mg, Cu
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d) Mg, Cl
Explanation
Answer: (a)
Q.5
In both I st and VII group of the periodic table following property increases with increase in atomic number .. [ NCERT 1981]
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a) Oxidising property
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b) Atomic size
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c) Highest valency state
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d) Reactivity with water
Explanation
Answer: (b)
Q.6
Which of the following atoms possesses the smallest volume?
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a) S
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b) Si
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c) P
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d) He
Explanation
Answer: (d)
Q.7
The ionization energy of an atom is the energy ... [ NCERT 1980]
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a) Needed to add an electron to an atom
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b) Needed to transfer an electron from one orbit to another
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c) Needed to convert the atom into radioactive isotope
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d) Just enough to cause an electron to escape from the atom
Explanation
Answer: (d)
Q.8
Ce-58 is a member of ... [ MLNR 1985]
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a) s-block elements
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b) p-block elements
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c) d-block elements
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d) f-block elements
Explanation
Ce-58 is lanthanide Answer: (d)
Q.9
In fluorine group of periodic table, on going down .. [ CPMT 1981]
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a) Ionic radius increases
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b) Electronegativity increases
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c) Ionization potential increases
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d) Reactivity increases
Explanation
Answer: (a)
Q.10
O22- is isoelectronic with .. [ Pb. PMT 1986]
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a) H2
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b) N2
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c) F2
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d) S
Explanation
O22- have 16 + 2=18 electrons F2 have 18 electronsAnswer: (c)
Q.11
Characteristic of transition element is ? .. [ DPMT 1984]
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a) Incomplete d-orbitals
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b) Incomplete f-orbitals
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c) Incomplete s-orbitals
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d) Incomplete p-orbitals
Explanation
Answer: (a)
Q.12
The first ionization potential in electron volts of nitrogen and oxygen atoms are respectively given by.. [ IIT 1987]
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a) 14.6, 13.6
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b) 13.6, 14.6
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c) 13.6, 13.6
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d) 14.6, 14.6
Explanation
Nitrogen have higher ionization potential than oxygen Answer: (a)
Q.13
The size of A, A+, A- follows the order.. [ AIIMS 1983]
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a) A+ > A- > A
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b) A- > A+ > A
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c) A- > A > A+
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d) A > A- > A+
Explanation
For A- electron gets added in outer orbit, in A+ electron gets removed from outermost orbit of A Answer : (c)
Q.14
In the isoelectronic species the ionic radii (in Angstron) of N3-, O2- and F- are respectively given by .. [ Pb CET 1989]
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a) 1.36 , 1.4, 1.71
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b) 1.36, 1.71, 1.40
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c) 1.71, 1.40, 1.36
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d) 1.71, 1.36, 1.4
Explanation
Answer: (c)
Q.15
Which of the following is isoelectronic with carbon atom? [ MP PMT 1994]
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a) Na+
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b) Al3+
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c) O2-
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d) N+
Explanation
carbon number of electrons=6 N+=7-1=6Answer: (d)
Q.16
Which one of the following is smallest in size? [ IIT 1989]
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a) N3-
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b) O2-
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c) F-
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d) Na+
Explanation
Amongst isoelectronic ions, cations are smallest Answer: (d)
Q.17
Which one of the following indicates the correct order of variation in atomic size .. [ EAMCET 1989]
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a) Be > C > F > Ne
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b) Be < C < F < Ne
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c) Be > C > F < Ne
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d) F < Ne < Be < C
Explanation
Atomic size decreases in period but noble gases have much larger size than other elements of the same period Answer: (c)
Q.18
In the periodic table, with the increase in atomic number, the metallic character of an element.. [ CBSE PMT 1989]
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a) Decrease in a period and increase ina group
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b) Increase in a period and decrease in a group
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c) Increases both in period and group
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d) Decreases in a period and the group
Explanation
Answer: (a)
Q.19
The electron configuration of an element is 1s22s22p63s23p63d104s24pIts properties will be similar to which of the following elements? [ MP PMT 1995]
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a) Boron
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b) Oxygen
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c) Nitrogen
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d) Chlorine
Explanation
Two different elements have similar chemical properties when they have the same number of valence electrons in their outermost energy level. question Outer configuration is 4s2 4p3 nitrogen configuration is [He] 2s2 2p3 Answer: (c)
Q.20
Arrange the following in creasing order of their atomic radii: Na, K, Mg, Rb? [ AFMC 1995]
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a) Mg < K < Na < Rb
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b) Mg < Na < K < Rb
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c) Mg < Na < Rb < K
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d) Na < K < Rb < Mg
Explanation
Since atomic radii increases down the group order Na < K < Rb Further, the atomic radii decreases along a period. Since the atomic number of Mg is 12 and that of Na is 11, therefore, the atomic radii pf Mg is lower than Na because of increased nuclear charge.Thus overall sequence is Mg < Na < K < RbAnswer: (b)
Q.21
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
Answer: (a)
Q.22
In a period, elements are arranged strictly in sequence of .. [ CPMT 1989]
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a) Decreasing charges in the nucleus
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b) Increasing charges in the nucleus
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c) Constant charges in the nucleus
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d) Equal charges in the nucleus
Explanation
Answer: (b)
Q.23
An atom of an element has electron configuration 2, 8,Which of the following statement is correct? [ MP PMT 1994]
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a) The element's valency is 7
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b) The element exists as diatomic molecule
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c) The element is a non-metallic in nature
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d) The element forms a basic oxide
Explanation
Given configuration implies that one electron can be easily removed, thus has metallic character, oxide will be basic Answer: (d)
Q.24
Which of the following compounds has the ratio of radius of cation and anion smallest? [ Raj PMT 1994]
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a) NaCl
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b) NaF
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c) MgF2
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d) MgCl2
Explanation
For cation-anion ratio to be smallest, the cation should be smallest and anion should be biggest. Smallest cation out of Na+ and Mg2+ is Mg2+ and bigger anion out of F- and Cl- is Cl- ion. Thus option (d) is correct Answer: (d)
Q.25
Which of the following is largest? [ CBSE PMT 1996]
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a) Cl-
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b) S2-
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c) Na+
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d) F-
Explanation
Cl- and S2- are iso electronic with Ar While Na+ and F- are isoelectronic with Ne. Therefore S2- has the largest sizeAnswer: (b)
Q.26
The valence shell electronic configuration of alkali metals is .. [ MP CEE 1996]
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a) ns2>/np1
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b) ns1
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c) (n-1)p6ns2
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d) (n-1)d2ns2
Explanation
Answer: (b)
Q.27
The electron affinity of halogens follows the order ... [ Pb. CET 1996]
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a) F > Cl > Br > I
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b) F < Cl > Br > I
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c) F < Cl < Br < I
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d) F < Cl < Br > I
Explanation
Electron affinity of Cl is highest and it decreases downwards. EA of F is however less than that of Cl Answer: (b)
Q.28
The electronegativity follows the order .. [ Pb. CET 1996]
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a) F > O > Cl > Br
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b) F > Cl > Br > O
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c) O > F > Cl > Br
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d) Cl > F > O > Br
Explanation
F and O belong to second period and E.N. of F >O, Cl and Br belong to 2rd and 4th periods respectively. Hence E.N. order is Cl > Be.Thus overall sequence of E.N. is F > O > Cl > Br Answer: (a)
Q.29
Which of the following has the largest size? [ MP PMT 1995]
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a) Al
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b) Al+
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c) Al2+
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d) Al3+
Explanation
Answer: (a)
Q.30
On moving down the group of regular elements both atomic and ionic radii increases with increasing .. [ Bihar CEE 1995]
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a) Atomic number
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b) Atomic weight
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c) Atomic mass
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d) None of these
Explanation
Answer: (a)
0 h : 0 m : 1 s
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