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NEET-UG SERIES
Chemistry

P Block Elements

91 previous year questions.

Volume: 91 Ques
Yield: High

High-Yield Trend

5
2023
3
2022
1
2021
4
2020
7
2019
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2018
3
2017
4
2016
2
2015
2
2014
2
2013
1
2012
2
2010
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2009
1
2008

Chapter Questions
91 MCQs

01
PYQ 1988
easy
chemistry ID: neet-ug-
Which of the following is a nitric acid anhydride?
1
NO
2
3
4
02
PYQ 1988
medium
chemistry ID: neet-ug-
Which one of the following compounds does not exist ?
1
2
3
4
03
PYQ 1989
easy
chemistry ID: neet-ug-
Oxygen will directly react with each of the following elements except?
1
P
2
CI
3
Na
4
S
04
PYQ 1989
medium
chemistry ID: neet-ug-
Each of the following is true for white and red phosphorus except that they
1
both are soluble in
2
can be oxidised by heating in air
3
consist of the same kind of atoms
4
can be converted into one another
05
PYQ 1989
medium
chemistry ID: neet-ug-
It is possible to obtain oxygen from air by fractional distillation because
1
oxygen is in a different group of the periodic table from nitrogen
2
oxygen is more reactive than nitrogen
3
oxygen has higher boiling point than nitrogen
4
oxygen has a lower density than nitrogen
06
PYQ 1989
medium
chemistry ID: neet-ug-
The gases respectively absorbed by alkaline pyrogallol and oil of cinnamon are
1
2
3
4
07
PYQ 1989
easy
chemistry ID: neet-ug-
When orthophosphoric acid is heated to 600 C, the product formed is
1
2
3
4
08
PYQ 1989
medium
chemistry ID: neet-ug-
Which one has the lowest boiling point?
1
2
3
4
09
PYQ 1989
medium
chemistry ID: neet-ug-
Bleaching powder reacts with a few drops of conc. HCI to give
1
chlorine
2
hypochlorous acid
3
calcium oxide
4
oxygen
10
PYQ 1989
medium
chemistry ID: neet-ug-
An example of a double salt is
1
bleaching powder
2
3
hypo
4
potash alum
11
PYQ 1989
medium
chemistry ID: neet-ug-
The substance used as a smoke screen in war fare is
1
2
3
4
acetylene
12
PYQ 1990
medium
chemistry ID: neet-ug-
The ability of a substance to assume in two or more crystalline structures is called
1
isomerism
2
polymorphism
3
isomorphism
4
amorphism
13
PYQ 1991
medium
chemistry ID: neet-ug-
is heated with water to give
1
hypophosphorous acid
2
phosphorous acid
3
hypophosphoric acid
4
orthophosphoric acid
14
PYQ 1991
medium
chemistry ID: neet-ug-
Pure nitrogen is prepared in the laboratory by heating a mixture of
1
2
3
4
15
PYQ 1991
medium
chemistry ID: neet-ug-
forms
1
2
3
4
16
PYQ 1991
medium
chemistry ID: neet-ug-
Oleum is
1
castor oil
2
oil of vitriol
3
4
None of these
17
PYQ 1991
medium
chemistry ID: neet-ug-
Basicity of orthophosphoric acid is
1
2
2
3
3
4
4
5
18
PYQ 1991
medium
chemistry ID: neet-ug-
Which would quickly absorb oxygen?
1
Alkaline solution of pyrogallol
2
3
Lime water
4
Alkaline solution of
19
PYQ 1991
medium
chemistry ID: neet-ug-
reacts with water to form
1
2
3
4
20
PYQ 1992
medium
chemistry ID: neet-ug-
When chlorine is passed over dry slaked lime at room temperature ,the main reaction product is
1
2
3
4
21
PYQ 1992
medium
chemistry ID: neet-ug-
Number of electrons shared in the formation of nitrogen molecule is
1
6
2
10
3
2
4
8
22
PYQ 1992
medium
chemistry ID: neet-ug-
Elements of which of the following groups will form anions most readily?
1
Oxygen family
2
Nitrogen family
3
Halogens
4
Alkali metals
23
PYQ 1992
medium
chemistry ID: neet-ug-
Which of the following bonds will be most polar ?
1
N-Cl
2
O-F
3
N-F
4
N-N
24
PYQ 1992
medium
chemistry ID: neet-ug-
is the molecular formula of an acid of phosphorous. Its name and basicity respectively are
1
phosphorous acid and 2
2
hypophosphorous acid and 2
3
hypophosphorous acid and one
4
hypophosphoric acid and two
25
PYQ 1993
medium
chemistry ID: neet-ug-
Which of the following species has four lone pairs of electrons?
1
I
2
3
4
He
26
PYQ 1993
medium
chemistry ID: neet-ug-
Which of the following noble gas is not present in atmosphere ?
1
He
2
Ne
3
Ar
4
Rn.
27
PYQ 1994
medium
chemistry ID: neet-ug-
Brown ring test is used to detect
1
Iodine
2
Nitrate
3
Iron
4
Bromide
28
PYQ 1994
medium
chemistry ID: neet-ug-

Which among the following is paramagnetic?

1
Cl2O
2
ClO2
3
Cl2O7
4
Cl2O6
29
PYQ 1994
medium
chemistry ID: neet-ug-
The acid which has a peroxy linkage is
1
sulphurous aci
2
pyrosulphuric aci
3
dithionic acid
4
Caro- acid
30
PYQ 1994
easy
chemistry ID: neet-ug-
The formula for calcium chlorite is
1
2
3
4
31
PYQ 1995
medium
chemistry ID: neet-ug-
About 20 km above the earth, there is an ozone layer. Which one of the following statements about ozone and ozone layer is true?
1
Ozone is a triatomic linear molecule
2
It is harmful as it stops useful radiation
3
It is beneficial to us as it stops UV-radiation
4
Conversion of is an endothermic reaction
32
PYQ 1996
medium
chemistry ID: neet-ug-
Among the following oxides, the least acidic is
1
2
3
4
33
PYQ 1996
medium
chemistry ID: neet-ug-
Which of the following bonds has the highest energy?
1
S - S
2
O - O
3
Se - Se
4
Te - Te
34
PYQ 1996
medium
chemistry ID: neet-ug-
Boron compounds behave as Lewis acids, because of their
1
ionisation property
2
electron deficient nature
3
acidic nature
4
covalent nature
35
PYQ 1997
medium
chemistry ID: neet-ug-
Which one of the following has the highest dipole moment?
1
2
3
4
36
PYQ 1997
medium
chemistry ID: neet-ug-
In graphite, electrons are
1
localised on each C-atom
2
localised on every third C-atom
3
spread out between the structure
4
Both (b) and (c)
37
PYQ 1998
medium
chemistry ID: neet-ug-
A one litre flask is full of brown bromine vapours. The intensity of brown colour of vapours will not decrease appreciably on adding to the flask some
1
pieces of marble
2
animal charcoal powder
3
carbon tetrachloride
4
) carbon disulphide
38
PYQ 2000
easy
chemistry ID: neet-ug-
Which of the following compound is electron deficient:
1

2

3

4

39
PYQ 2000
medium
chemistry ID: neet-ug-
Which compound form linear polymer due to H-bond:
1

2

3

4

40
PYQ 2001
easy
chemistry ID: neet-ug-

PbO2 PbO ∆G298< 0,

SnO2 SnO ∆G298 > 0,
Most probable oxidation state of Pb & Sn will be

1

Pb+4, Sn+2

2

Pb+4, Sn+2

3

Pb+2, Sn+2

4

Pb+2, Sn+4

41
PYQ 2001
medium
chemistry ID: neet-ug-
Nitrogen form N2, but phosphorous form P2, it's at a time convert in P4, reason is
1
Triple bond present between phosphorous atom
2
pπ – pπ bonding is weak
3
pπ – pπ bonding is strong
4
Multiple bond form easilly
42
PYQ 2002
medium
chemistry ID: neet-ug-
Which of the following statements is true:-
1
Silicon exhibits 4 coordination number in its compounds
2
Bond energy of is less than
3
Mn(lll) oxidation state is more stable than Mn(ll) in aqueous state
4
Elements of group shows only +3 and +5 oxidation states
43
PYQ 2002
medium
chemistry ID: neet-ug-

Which of the following order is wrong :

1

NH3 < PH3 < AsH3 – Acidic

2

Li < Be < B < C – Ist IP

3

Al2O3 < MgO < Na2O < K2O - Basic

4

Li+< Na+< K+< Cs+- Ionic radius

44
PYQ 2002
medium
chemistry ID: neet-ug-
In borex bead test which compound is formed
1
Ortho borate
2
Meta borate
3
Double oxide
4
Tetra borate
45
PYQ 2003
medium
chemistry ID: neet-ug-
Which one of the following compounds is not a protonic acid:
1
2
3
4
46
PYQ 2003
medium
chemistry ID: neet-ug-
Which of the following statements is not true:
1
Among halide ions, iodide is the most powerful reducing agent
2
Fluorine is the only halogen that does not show a variable oxidation state
3
HOCl is a stronger acid than HOBr
4
HF is a stronger acid than HCl
47
PYQ 2004
medium
chemistry ID: neet-ug-
Which one of the following statements about the zeolites is false ?
1
They are used as cation exchangers
2
They have open structure which enables them to take up small molecules
3
Zeolites are aluminosilicates having three dimensional network
4
Some of the units are replaced by and ions in zeolites
48
PYQ 2005
medium
chemistry ID: neet-ug-
Which one of the following oxides is expected to exhibit paramagnetic behaviour ?
1

CO2

2

SO2

3

ClO2

4

SiO2

49
PYQ 2005
medium
chemistry ID: neet-ug-
Which of the following is the electron deficient molecule?
1
B2H6
2
C2H6
3
PH3
4
SiH4
50
PYQ 2006
medium
chemistry ID: neet-ug-
can be converted into anhydrous by heating
1
with HCI gas
2
with NaCI in solid state
3
a mixture of and carbon in dry gas
4
with gas
51
PYQ 2006
medium
chemistry ID: neet-ug-
Which of the following is the most basic oxide ?
1
Al2O3
2
Sb2O3
3
Bi2O3
4
SeO2
52
PYQ 2007
medium
chemistry ID: neet-ug-
Which of the following oxidation states are the most characteristics for lead and tin respectively?
1
+4, +2
2
+2, +4
3
+4, + 4
4
+2, +2
53
PYQ 2008
medium
chemistry ID: neet-ug-
The angular shape of ozone molecule consists of
1
1 sigma and 2 pi-bonds
2
2 sigma and 2 pi-bonds
3
1 sigma and 1 pi-bonds
4
2 sigma and 1 pi-bonds
54
PYQ 2009
medium
chemistry ID: neet-ug-
Among the following which is the strongest oxidising agent?
1
2
3
4
55
PYQ 2010
easy
chemistry ID: neet-ug-
How many bridging oxygen atoms are present in ?
1
4
2
2
3
5
4
6
56
PYQ 2010
medium
chemistry ID: neet-ug-
Oxidation states of in respectively are
1
#ERROR!
2
- 5, + 3 and + 4
3
#ERROR!
4
#ERROR!
57
PYQ 2012
medium
chemistry ID: neet-ug-
In which of the following compounds, nitrogen exhibits highest oxidation state ?
1
2
3
4
58
PYQ 2013
medium
chemistry ID: neet-ug-
The basic structural unit of silicates is
1
SiO-
2
3
4
59
PYQ 2013
medium
chemistry ID: neet-ug-
Which of the following structure is similar to graphite?
1
2
3
4
60
PYQ 2014
medium
chemistry ID: neet-ug-
Acidity of diprotic acids in aqueous solutions increases in the order:
1
H2Se < H2S < H2Te
2
H2Te < H2S < H2Se
3
H2Se < H2Te < H2S
4
H2S < H2Se < H2Te
61
PYQ 2014
hard
chemistry ID: neet-ug-
(a)
(b)
Role of hydrogen peroxide in the above reactions is respectively:
1
Reducing in (a) and oxidizing in (b)
2
Reducing in (a) and (b)
3

Oxidizing in (a) and (b)

4
Oxidizing in (a) and reducing in (b)
62
PYQ 2015
medium
chemistry ID: neet-ug-
Nitrogen dioxide and sulphur have some properties in common. Which property is shown by one of these compounds, but not by the other?
1
is soluble in water
2
is used as a food-preservative
3
forms �acid-rain�
4
is a reducing agent
63
PYQ 2015
easy
chemistry ID: neet-ug-
Which of the statements given below is incorrect ?
1
ONF is isoelectronic with
2
is an oxide of fluorine
3
is an anhydride of perchloric acid
4
molecule is bent
64
PYQ 2016
medium
chemistry ID: neet-ug-
Which is the correct statement for the given acids ?
1
Phosphinic acid is a monoprotic acid while phosphonic acid is a diprotic acid
2
Phosphinic acid is a diprotic acid while phosphonic acid is a monoprotic acid
3
Both are triprotic acids
4
Both are diprotic acids
65
PYQ 2016
medium
chemistry ID: neet-ug-
When copper is heated with conc. it produces :
1
and
2
and
3
and
4
and
66
PYQ 2016
medium
chemistry ID: neet-ug-
Among the following the correct order of acidity is :
1
2
3
4
67
PYQ 2016
medium
chemistry ID: neet-ug-
Boric acid is an acid because its molecule
1
contains replaceable ion
2
gives up a proton
3
accepts from water releasing proton
4
combines with proton from water molecule
68
PYQ 2017
easy
chemistry ID: neet-ug-
Match the interhalogen compounds of column-I with the geometry in column II and assign the correct. code.
Column I Column II
(a) (i) T-shape
(b) (ii) Pentagonal bipyramidal
(c) (iii) Linear
(d) (iv) Square-pyramidal
(v) Tetrahedral
1
(iii), (i), (iv), (ii)
2
(v), (iv), (iii), (ii)
3
(iv), (iii), (ii),(i)
4
(iii), (iv), (i), (ii)
69
PYQ 2017
medium
chemistry ID: neet-ug-
It is because of inability of electrons of the valence shell to participate in bonding that:-
1
is oxidising while is reducing
2
and are both oxidising and reducing
3
is reducing while is oxidising
4
is reducing while is oxidising
70
PYQ 2017
medium
chemistry ID: neet-ug-
It is because of inability of electrons of the valence shell to participate in bonding that:-
1
is oxidising while is reducing
2
and are both oxidising and reducing
3
is reducing while is oxidising
4
is reducing while is oxidising
71
PYQ 2018
medium
chemistry ID: neet-ug-
Which of the following statements is not true for halogens?
1
Chlorine has the highest electron-gain enthalpy.
2
All form monobasic oxyacids.
3
All but fluorine show positive oxidation states
4
All are oxidizing agents
72
PYQ 2019
medium
chemistry ID: neet-ug-
For the second period elements the correct increasing order of first ionisation enthalpy is :
1
Li < Be < B < C < N < O < F < Ne
2
Li < B < Be < C < O < N < F < Ne
3
Li < B < Be < C < N < O < F < Ne
4
Li < Be < B < C < O < N < F < Ne
73
PYQ 2019
medium
chemistry ID: neet-ug-
Match the Xenon compounds in Column-I with its structure in Column II and assign the correct code:

Column I

Column II
A Ipyramidall
B IIsquare planar
C IIIdistorted octahedral
D IVsquare pyramidal
Code:
1
(a)-(i) (b)-(ii) (c)-(iii) (d)-(iv)
2
(a)-(ii) (b)-(iii) (c)-(iv) (d)-(i)
3
(a)-(ii) (b)-(iii) (c)-(i) (d)-(iv)
4
(a)-(iii) (b)-(iv) (c)-(i) (d)-(ii)
74
PYQ 2019
medium
chemistry ID: neet-ug-
Which of the following is incorrect statement?
1
is covalent in nature
2
is easily hydrolysed
3
( ) is more stable than
4
is ionic in nature
75
PYQ 2019
medium
chemistry ID: neet-ug-
Which is the correct thermal stability order for (E = O. S. Se. Te and ) ?
1
2
3
4
76
PYQ 2019
medium
chemistry ID: neet-ug-
Which of the following species is not stable ?
1
2
3
4
77
PYQ 2019
medium
chemistry ID: neet-ug-
Which of the following is incorrect statement ?
1
(X= F, Cl. Br. I) is more stable than
2
is ionic in nature
3
is covalent in nature
4
, is easily hydrolysed
78
PYQ 2019
medium
chemistry ID: neet-ug-
Identify the incorrect statement related to from the following:
1
Axial P �Cl bonds are longer than equatorial P�Cl bonds
2
molecule is non-reactive
3
Three equatorial P - Cl bonds make an angle of 120� with each other
4
Two axial P - Cl bonds make an angle of 180� with each other
79
PYQ 2020
medium
chemistry ID: neet-ug-
Urea reacts with water to form which will decompose to form . when passed through , deep blue colour solution C is formed. What is the formula of C from the following
1
2
3
4
80
PYQ 2020
medium
chemistry ID: neet-ug-
Identify the correct statements from the following:
(a) is used as refrigerant for ice-cream and frozen food.
(b) The structure of contains twelve six carbon rings and twenty-five carbon rings.
(c) , a type of zeolite, is used to convert alcohols into gasoline.
(d) is colorless and odourless gas.
1
(a), (b) and (c) only
2
(a) and (c) only
3
(b) and (c) only
4
(c) and (d) only
81
PYQ 2020
medium
chemistry ID: neet-ug-
Which of the following oxoacid of sulphur has -O-O- linkage?
1
, sulphurous acid
2
sulphuric acid
3
, peroxodisulphuric acid
4
, pyrosulphuric acid
82
PYQ 2020
medium
chemistry ID: neet-ug-
Match the following
OxideNature
(a)CO(ii)Neutral
(b)BaO(i)Basic
(c) (iv)Amphoteric
(d) (iii)Acidic

Which of the following is correct option ?
1
2
3
4
83
PYQ 2021
medium
chemistry ID: neet-ug-

In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it

1

CO2 < SiO2 < SnO2 < PbO2 :Increasing oxidizing power

2

HF < HCl< HBr < HI:Increasing acidic strength

3

H2O < H2S< H2Se < H2Te:Increasing pKa values

4

NH3 < PH3< AsH3 < SbH3:Increasing acidic character

84
PYQ 2022
medium
chemistry ID: neet-ug-
Statement I: The boiling points of the following hydrides of group 16 elements increases in the order - H2O < H2S < H2Se < H2Te
Statement II: The boiling points of these hydrides increases with increase in molar mass.
In the light of the above statements, choose the most appropriate answer from the options given below:
1
Both Statement I and Statement II are correct.
2
Both Statement I and Statement II are incorrect.
3
Statement I is correct but Statement II is incorrect.
4
Statement I is incorrect but Statement II is correct.
85
PYQ 2022
medium
chemistry ID: neet-ug-
Assertion (A): ICl is more reactive than I2
Reason(R): I-Cl bond is weak than I-I bond
Choose the most appropriate answer from the options given below:
1
Both (A) and (R) are correct and (R) is the correct explanation of (A)
2
Both (A) and (R) are correct but (R) is not the correct explanation of (A)
3
(A) is correct but (R) is not correct
4
(A) is not correct but (R) is correct
86
PYQ 2022
easy
chemistry ID: neet-ug-
Identify the incorrect statement from the following
1
Alkali metals react with water to form their hydroxides
2
The oxidation number of K in KO2 is +4.
3
Ionisation enthalpy of alkali metals decreases from top to bottom in the group.
4
Lithium is the strongest reducing agent among the alkali metals.
87
PYQ 2023
easy
chemistry ID: neet-ug-
The stability of is more than salts in aqueous solution due to
1
Enthalpy of atomization
2
Hydration energy
3
Second ionisation enthalpy
4
First ionisation enthalpy
88
PYQ 2023
hard
chemistry ID: neet-ug-
Taking stability as the factor, which one of the following represents correct relationship?
1

Inl3 > Inl

2

AlCl > AlCl3

3

TII > TII3

4

Tll3 > TlCl

89
PYQ 2023
easy
chemistry ID: neet-ug-
Match List-I with List-Il:
List-I List-II
A. CokeI.Carbon atoms are sp3 hybridized.
B. DiamondII.Used as a dry lubricant.
C. FullereneIII.Used as a reducing agent.
D. Graphite IV.Cage like molecules
Choose the correct answer from the options given below:
1
A-lV, B-I, C-II, D-III
2
A-III, B-I, C-IV, D-II
3
A-llI, B-IV, C-I, D-II
4
A-II, B-IV, C-I, D-III
90
PYQ 2023
medium
chemistry ID: neet-ug-
Match List-I with List – II :
List-I (Oxoacids of Sulphur) List-II (Bonds)
APeroxodisulphuric acid ITwo S–OH, Four S=O, One S–O–S
BSulphuric acid IITwo S–OH, One S=O
CPyrosulphuric acidIIITwo S–OH, Four S=O, One S–O–O–S
DSulphurous acidIVTwo S–OH, Two S=O
Choose the correct answer from the options given below.
1
A–III, B–IV, C–I, D–II
2
A–I, B–III, C–IV, D–II
3
A–I, B–III, C–IV, D–II
4
A–I, B–III, C–II, D–IV
91
PYQ 2023
hard
chemistry ID: neet-ug-
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: Helium is used to dilute oxygen in diving apparatus.
Reason R: Helium has high solubility in O2.
In the light of the above statements, choose the correct answer from the options given below.
1
Both A and R are true but R is NOT the correct explanation of A.
2

A is true but R is false.

3

A is false but R is true.

4
Both A and R are true and R is the correct explanation of A.