P Block Elements

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

Cl 2 O

2

ClO 2

3

Cl 2 O 7

4

Cl 2 O 6

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-

PbO 2 PbO ∆G 298 < 0, SnO 2 SnO ∆G 298 > 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

NH 3 < PH 3 < AsH 3 - Acidic

2

Li < Be < B < C - Ist IP

3

Al 2 O 3 < MgO < Na 2 O < K 2 O - 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

CO 2

2

SO 2

3

ClO 2

4

SiO 2

49

PYQ 2005

medium

chemistry ID: neet-ug-

Which of the following is the electron deficient molecule?

1

B 2 H 6

2

C 2 H 6

3

PH 3

4

SiH 4

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

Al 2 O 3

2

Sb 2 O 3

3

Bi 2 O 3

4

SeO 2

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

H 2 Se < H 2 S < H 2 Te

2

H 2 Te < H 2 S < H 2 Se

3

H 2 Se < H 2 Te < H 2 S

4

H 2 S < H 2 Se < H 2 Te

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

Column I	Column II
(a)	$XX'$	(i)	T-shape
(b)	$XX'_3$	(ii)	Pentagonal bipyramidal
(c)	$XX'_5$	(iii)	Linear
(d)	$XX'_7$	(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 I pyramidall B II square planar C III distorted octahedral D IV square 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 Oxide Nature (a) CO (ii) Neutral (b) BaO (i) Basic (c) (iv) Amphoteric (d) (iii) Acidic Which of the following is correct option ?

Oxide	Nature
(a)	CO	(ii)	Neutral
(b)	BaO	(i)	Basic
(c)	$Al_%7B2%7DO_%7B3%7D$	(iv)	Amphoteric
(d)	$Cl_%7B2%7DO_%7B7%7D$	(iii)	Acidic

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

CO 2 < SiO 2 < SnO 2 < PbO 2 :Increasing oxidizing power

2

HF < HCl< HBr < HI:Increasing acidic strength

3

H 2 O < H 2 S< H 2 Se < H 2 Te:Increasing pKa values

4

NH 3 < PH 3 < AsH 3 < SbH 3 :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 - H 2 O < H 2 S < H 2 Se < H 2 Te 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 I 2 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

Inl 3 > Inl

2

AlCl > AlCl 3

3

TII > TII 3

4

Tll 3 > TlCl

89

PYQ 2023

easy

chemistry ID: neet-ug-

Match List-I with List-Il: List-I List-II A. Coke I. Carbon atoms are sp 3 hybridized. B. Diamond II. Used as a dry lubricant. C. Fullerene III. 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) A Peroxodisulphuric acid I Two S-OH, Four S=O, One S-O-S B Sulphuric acid II Two S-OH, One S=O C Pyrosulphuric acid III Two S-OH, Four S=O, One S-O-O-S D Sulphurous acid IV Two 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 O 2 . 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.

Column I		Column II
A	$XeF_4$	I	pyramidall
B	$XeFe_6$	II	square planar
C	$XeOF_4$	III	distorted octahedral
D	$XeO_3$	IV	square pyramidal

	List-I		List-II
A.	Coke	I.	Carbon atoms are sp³ hybridized.
B.	Diamond	II.	Used as a dry lubricant.
C.	Fullerene	III.	Used as a reducing agent.
D.	Graphite	IV.	Cage like molecules

	List-I (Oxoacids of Sulphur)		List-II (Bonds)
A	Peroxodisulphuric acid	I	Two S–OH, Four S=O, One S–O–S
B	Sulphuric acid	II	Two S–OH, One S=O
C	Pyrosulphuric acid	III	Two S–OH, Four S=O, One S–O–O–S
D	Sulphurous acid	IV	Two S–OH, Two S=O

High-Yield Trend

Chapter Questions 91 MCQs

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Reaction of Copper with Concentrated Nitric Acid

Explanation:

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Lewis Acid and Boric Acid

Boric Acid Reaction

Structure of Boric Acid

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Chapter Questions
91 MCQs