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p-Block Elements

276 Questions Start JEE Mains Test
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2021 Q151 JEE Mains MCQ
14 Mar 2026
Match List - I with List - II :

List - I
(compound)		 List - II
(effect/affected species)
(a) Carbon monoxide (i) Carcinogenic
(b) Sulphur dioxide (ii) Metabolized by pyrus plants
(c) Polychlorinated biphenyls (iii) haemoglobin
(d) Oxides of Nitrogen (iv) Stiffness of flower buds


Choose the correct answer from the options given below :
A.
(a) - (iii), (b) - (iv), (c) - (i), (d) - (ii)
B.
(a) - (iv), (b) - (i), (c) - (iii), (d) - (ii)
C.
(a) - (i), (b) - (ii), (c) - (iii), (d) - (iv)
D.
(a) - (iii), (b) - (iv), (c) - (ii), (d) - (i)
2021 Q152 JEE Mains MCQ
14 Mar 2026
Number of Cl = O bonds in chlorous acid, chloric acid and perchloric acid respectively are :
A.
3, 1 and 1
B.
4, 1 and 0
C.
1, 1 and 3
D.
1, 2 and 3
2021 Q153 JEE Mains MCQ
14 Mar 2026
The product obtained from the electrolytic oxidation of acidified sulphate solutions, is :
A.
HSO$_4^ - $
B.
HO3SOOSO3H
C.
HO2SOSO2H
D.
HO3SOSO3H
2021 Q154 JEE Mains MCQ
14 Mar 2026
Which one of the following compounds of Group-14 elements is not known?
A.
[GeCl6]2$-$
B.
[Sn(OH)6]2$-$
C.
[SiCl6]2$-$
D.
[SiF6]2$-$
2021 Q155 JEE Mains MCQ
14 Mar 2026
Given below are the statements about diborane

(a) Diborane is prepared by the oxidation of NaBH4 with I2

(b) Each boron atom is in sp2 hybridized state

(c) Diborane has one bridged 3 centre-2-electron bond

(d) Diborane is a planar molecule

The option with correct statements is :
A.
(c) and (d) only
B.
(a) only
C.
(c) only
D.
(a) and (b) only
2021 Q156 JEE Mains MCQ
14 Mar 2026
Which one of the following group-15 hydride is the strongest reducing agent?
A.
AsH3
B.
BiH3
C.
PH3
D.
SbH3
2021 Q157 JEE Mains MCQ
14 Mar 2026
The species given below that does NOT show disproportionation reaction is :
A.
$BrO_4^ - $
B.
$Br{O^ - }$
C.
$BrO_2^ - $
D.
$BrO_3^ - $
2021 Q158 JEE Mains MCQ
14 Mar 2026
Chemical nature of the nitrogen oxide compound obtained from a reaction of concentrated nitric acid and P4O10 (in 4 : 1 ratio) is :
A.
acidic
B.
basic
C.
amphoteric
D.
neutral
2021 Q159 JEE Mains MCQ
14 Mar 2026
Match List - I with List - II

List - I
(process)		 List - II
(catalyst)
(a) Deacron's process (i) ZSM-5
(b) Contact process (ii) $CuC{l_2}$
(c) Cracking of hydrocarbons (iii) Particles 'Ni'
(d) Hydrogenation of vegetable oils (iv) ${V_2}{O_5}$


Choose the most appropriate answer from the options given below :
A.
(a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
B.
(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
C.
(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
D.
(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
2021 Q160 JEE Mains MCQ
14 Mar 2026
The number of ionisable hydrogens present in the product obtained from a reaction of phosphorus trichloride and phosphonic acid is :
A.
3
B.
0
C.
2
D.
1
2021 Q161 JEE Mains MCQ
14 Mar 2026
The set that represents the pair of neutral oxides of nitrogen is :
A.
NO and N2O
B.
N2O and NO2
C.
NO and NO2
D.
N2O and N2O3
2021 Q162 JEE Mains MCQ
14 Mar 2026
The INCORRECT statement regarding the structure of C60 is :
A.
The five-membered rings are fused only to six-membered rings.
B.
It contains 12 six-membered rings and 24 five-membered rings.
C.
Each carbon atom forms three sigma bonds.
D.
The six-membered rings are fused to both six and five-membered rings.
2021 Q163 JEE Mains MCQ
14 Mar 2026
Match List - I with List - II :

List - I
Industrial process		 List - II
Application
(a) Haber's process (i) $HN{O_3}$ synthesis
(b) Ostwald's process (ii) Aluminium extraction
(c) Contact process (iii) $N{H_3}$ synthesis
(d) Hal-Heroult process (iv) ${H_2}S{O_4}$ synthesis


Choose the correct answer from the options given below :
A.
(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
B.
(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
C.
(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
D.
(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
2021 Q164 JEE Mains MCQ
14 Mar 2026
A group of 15 element, which is a metal and forms a hydride with strongest reducing power among group 15 hydrides. The element is :
A.
As
B.
Sb
C.
Bi
D.
P
2021 Q165 JEE Mains MCQ
14 Mar 2026
Match List - I with List - II :

List - I
Name of oxo acid		 List - II
Oxidation state of 'P'
(a) Hypophosphorous acid (i) +5
(b) Orthophosphoric acid (ii) +4
(c) Hypophosphoric acid (iii) +3
(d) Orthophosphorous acid (iv) +2
(v) +1


Choose the correct answer from the options given below :
A.
(a) - (iv), (b) - (v), (c) - (ii), (d) - (iii)
B.
(a) - (iv), (b) - (i), (c) - (ii), (d) - (iii)
C.
(a) - (v), (b) - (i), (c) - (ii), (d) - (iii)
D.
(a) - (v), (b) - (iv), (c) - (ii), (d) - (iii)
2021 Q166 JEE Mains MCQ
14 Mar 2026
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : In TlI3, isomorphous to CsI3, the metal is present in +1 oxidation state.

Reason R : Tl metal has fourteen f electrons in its electronic configuration.

In the light of the above statements, choose the most appropriate answer from the options given below :
A.
A is correct but R is not correct
B.
A is not correct but R is correct
C.
Both A and R are correct but R is NOT the correct explanation of A
D.
Both A and R are correct and R is the correct explanation of A
2021 Q167 JEE Mains MCQ
14 Mar 2026
Find A, B and C in the following reactions :

$N{H_3} + A + C{O_2} \to {(N{H_4})_2}C{O_3}$

${(N{H_4})_2}C{O_3} + {H_2}O + B \to N{H_4}HC{O_3}$

$N{H_4}HC{O_3} + NaCl \to N{H_4}Cl + C$
A.
$A - {O_2};B - C{O_2};C - N{a_2}C{O_3}$
B.
$A - {H_2}O;B - {O_2};C - NaHC{O_3}$
C.
$A - {H_2}O;B - {O_2};C - N{a_2}C{O_3}$
D.
$A - {H_2}O;B - C{O_2};C - NaHC{O_3}$
2021 Q168 JEE Mains MCQ
14 Mar 2026
On treating a compound with warm dil. H2SO4, gas X is evolved which turns K2Cr2O7 paper acidified with dil. H2SO4 to a green compound Y. X and Y respectively are :
A.
X = SO2, Y = Cr2O3
B.
X = SO3, Y = Cr2(SO4)3
C.
X = SO3, Y = Cr2O3
D.
X = SO2, Y = Cr2(SO4)3
2021 Q169 JEE Mains MCQ
14 Mar 2026
Given below are two statements :

Statement I : $\alpha$ and $\beta$ forms of sulphur can change reversibly between themselves with slow heating or slow cooling.

Statement II : At room temperature the stable crystalline form of sulphur is monoclinic sulphur.

In the light of the above statements, choose the correct answer from the options given below :
A.
Statement I is true but Statement II is false.
B.
Statement I is false but Statement II is true.
C.
Both Statement I and Statement II are true.
D.
Both Statement I and Statement II are false.
2021 Q170 JEE Mains MCQ
14 Mar 2026
The correct statement about B2H6 is :
A.
Its fragment, BH3, behaves as a Lewis base.
B.
All B$-$H$-$B angles are of 120$^\circ$.
C.
The two B$-$H$-$B bonds are not of same length.
D.
Terminal B$-$H bonds have less p-character when compared to bridging bonds.
2021 Q171 JEE Mains MCQ
14 Mar 2026
Al2O3 was leached with alkali to get X. The solution of X on passing of gas Y, forms Z. X, Y and Z respectively are :
A.
X = Na[Al(OH)4], Y = CO2, Z = Al2O3.xH2O
B.
X = Al(OH)3, Y = CO2, Z = Al2O3
C.
X = Al(OH)3, Y = SO2, Z = Al2O3.xH2O
D.
X = Na[Al(OH)4], Y = SO2, Z = Al2O3
2021 Q172 JEE Mains Numerical
14 Mar 2026
Consider the sulphides HgS, PbS, CuS, Sb2S3, As2S3 and CdS. Number of these sulphides soluble in 50% HNO3 is ___________.
2021 Q173 JEE Mains Numerical
14 Mar 2026
The number of halogen/(s) forming halic (V) acid is ___________.
2021 Q174 JEE Mains Numerical
14 Mar 2026
A xenon compound 'A' upon partial hydrolysis gives XeO2F2. The number of lone pair of electrons present in compound A is _________. (Round off to the Nearest Integer)
2021 Q175 JEE Mains Numerical
14 Mar 2026
The reaction of white phosphorus on boiling with alkali in inert atmosphere resulted in the formation of product 'A'. The reaction of 1 mol of 'A' with excess of AgNO3 in aqueous medium gives ___________ mol(s) of Ag. (Round off to the Nearest Integer).
2021 Q176 JEE Mains Numerical
14 Mar 2026
Among the following allotropic forms of sulphur, the number of allotropic forms, which will show paramagnetism is _________.

(A) $\alpha$-sulphur

(B) $\beta$-sulphur

(C) S2-form
2021 Q177 JEE Mains Numerical
14 Mar 2026
The reaction of sulphur in alkaline medium is given below:

JEE Main 2021 (Online) 24th February Morning Shift Chemistry - p-Block Elements Question 176 English
The values of 'a' is _______. (Integer answer)
2020 Q178 JEE Mains MCQ
14 Mar 2026
The reaction of NO with N2O4 at 250 K gives :
A.
N2O3
B.
N2O5
C.
N2O
D.
NO2
2020 Q179 JEE Mains MCQ
14 Mar 2026
Reaction of an inorganic sulphite X with dilute H2SO4 generates compound Y. Reaction of Y with NaOH gives X. Further, the reaction of X with Y and water affords compound Z. Y and Z, respectively, are :
A.
S and Na2SO3
B.
SO2 and NaHSO3
C.
SO2 and Na2SO3
D.
SO3 and NaHSO3
2020 Q180 JEE Mains MCQ
14 Mar 2026
The correct statement with respect to dinitrogen is :
A.
N2 is paramagnetic in nature
B.
it can be used as an inert diluent for reactive chemicals
C.
it can combine with dioxygen at 25oC
D.
liquid dinitrogen is not used in cryosurgery
2020 Q181 JEE Mains MCQ
14 Mar 2026
Boron and silicon of very high purity can be obtained through :
A.
Liquation
B.
Electrolytic refining
C.
Zone refining
D.
Vapour phase refining
2020 Q182 JEE Mains MCQ
14 Mar 2026
Reaction of ammonia with excess Cl2 gives :
A.
NH4Cl and N2
B.
NH4Cl and HCl
C.
NCl3 and HCl
D.
NCl3 and NH4Cl
2020 Q183 JEE Mains MCQ
14 Mar 2026
On heating, lead (II) nitrate gives a brown gas (A). The gas (A) on cooling changes to a colourless solid/liquid (B). (B) on heating with NO changes to a blue solid (C). The oxidation number of nitrogen in solid (C) is :
A.
+3
B.
+4
C.
+5
D.
+2
2020 Q184 JEE Mains MCQ
14 Mar 2026
Aqua regia is used for dissolving noble metals (Au, Pt, etc.). The gas evolved in this process is :
A.
N2O3
B.
N2
C.
N2O5
D.
NO
2020 Q185 JEE Mains MCQ
14 Mar 2026
In a molecule of pyrophosphoric acid, the number of P - OH, P = O and P - O - P bonds/moiety(ies) respectively are :
A.
4, 2 and 0
B.
4, 2 and 1
C.
3, 3 and 3
D.
2, 4 and 1
2020 Q186 JEE Mains MCQ
14 Mar 2026
On heating compound (A) gives a gas (B) which is a constituent of air. This gas when treated with H2 in the presence of a catalyst gives another gas (C) which is basic in nature. (A) should not be :
A.
Pb(NO3)2
B.
(NH4)2Cr2O7
C.
NH4NO2
D.
NaN3
2020 Q187 JEE Mains MCQ
14 Mar 2026
The reaction of H3N3B3Cl3 (A) with LiBH4 in tetrahydrofuran gives inorganic benzene (B). Further, the reaction of (A) with (C) leads to H3N3B3(Me)3. Compounds (B) and (C) respectively, are :
A.
Borazine and MeBr
B.
Diborane and MeMgBr
C.
Boron nitride and MeBr
D.
Borazine and MeMgBr
2020 Q188 JEE Mains MCQ
14 Mar 2026
'X' melts at low temperature and is a bad conductor of electricity in both liquid and solid state. X is :
A.
Mercury
B.
Carbon tetrachloride
C.
Zinc sulphide
D.
Silicon carbide
2020 Q189 JEE Mains MCQ
14 Mar 2026
A metal (A) on heating in nitrogen gas gives compound B. B on treatment with H2O gives a colourless gas which when passed through CuSO4 solution gives a dark blue-violet coloured solution. A and B respectively, are :
A.
Na and NaNO3
B.
Na and Na3N
C.
Mg and Mg3N2
D.
Mg and Mg(NO3)2
2020 Q190 JEE Mains MCQ
14 Mar 2026
White Phosphorus on reaction with concentrated NaOH solution in an inert atmosphere of CO2 gives phosphine and compound (X). (X) on acidification with HCl gives compound (Y). The basicity of compound (Y) is :
A.
2
B.
4
C.
1
D.
3
2020 Q191 JEE Mains MCQ
14 Mar 2026
The number of bonds between sulphur and oxygen atoms in S2O82- and the number of bonds between sulphur and sulphur atoms in rhombic sulphur, respectively, are :
A.
4 and 8
B.
8 and 6
C.
4 and 6
D.
8 and 8
2020 Q192 JEE Mains MCQ
14 Mar 2026
In the following reaction, products (A) and (B) respectively, are :

NaOH + Cl2 $ \to $ (A) + side products
(hot and conc.)

Ca(OH)2 + Cl2 $ \to $ (B) + side products (dry)
A.
NaOCl and Ca(OCl)2
B.
NaClO3 and Ca(ClO3)2
C.
NaOCl and Ca(ClO3)2
D.
NaClO3 and Ca(OCl)2
2019 Q193 JEE Mains MCQ
14 Mar 2026
The C–C bond length is maximum in :
A.
C60
B.
diamond
C.
graphite
D.
C70
2019 Q194 JEE Mains MCQ
14 Mar 2026
The basic structural unit of feldspar, zeolites, mica, and asbestos is :
A.
JEE Main 2019 (Online) 12th April Morning Slot Chemistry - p-Block Elements Question 194 English Option 1
B.
(SiO4)4–
C.
(SiO3)2–
D.
SiO2
2019 Q195 JEE Mains MCQ
14 Mar 2026
The noble gas that does not occur in the atmosphere is :
A.
Ne
B.
He
C.
Kr
D.
Ra
2019 Q196 JEE Mains MCQ
14 Mar 2026
The number of pentagons in C60 and trigons (triangles) in white phosphorus, respectively, are :
A.
12 and 3
B.
20 and 3
C.
20 and 4
D.
12 and 4
2019 Q197 JEE Mains MCQ
14 Mar 2026
The correct order of catenation is :
A.
C > Sn > Si $ \approx $ Ge
B.
Si > Sn > C > Ge
C.
C > Si > Ge $ \approx $ Sn
D.
Ge > Sn > Si > C
2019 Q198 JEE Mains MCQ
14 Mar 2026
The correct statements among I to III regarding group 13 element oxides are,
(I) Boron trioxide is acidic.
(II) Oxides of aluminium and gallium are amphoteric.
(III) Oxides of indium and thalliumare basic.
A.
(II) and (III) only
B.
(I), (II) and (III)
C.
(I) and (III) only
D.
(I) and (II) only
2019 Q199 JEE Mains MCQ
14 Mar 2026
The amorphous form of silica is :
A.
kieselguhr
B.
quartz
C.
tridymite
D.
cristobalite
2019 Q200 JEE Mains MCQ
14 Mar 2026
C60 an allotrope of carbon contains :
A.
12 hexagons and 20 pentagons.
B.
20 hexagons and 12 pentagons.
C.
16 hexagons and 16 pentagons
D.
18 hexagons and 14 pentagons.