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p-Block Elements

276 Questions Start JEE Mains Test
All Exams JEE Mains JEE Advanced TS-EAMCET AP-EAPCET BITSAT
2008 Q251 JEE Mains MCQ
14 Mar 2026
Which one of the following is the correct statement?
A.
Boric acid is a protonic acid
B.
Beryllium exhibits coordination number of six
C.
Chlorides of both beryllium and aluminium have bridged chloride structures in solid phase
D.
B2H6.2NH3 is known as ‘inorganic benzene’
2007 Q252 JEE Mains MCQ
14 Mar 2026
The stability of dihalides of $Si,Ge,Sn$ and $Pb$ increases steadily in the sequence :
A.
$Pb{X_2} < < Sn{X_2} < < Ge{X_2} < < Si{X_2}$
B.
$Ge{X_2} < < Si{X_2} < < Sn{X_2} < < Pb{X_2}$
C.
$Si{X_2} < < Ge{X_2} < < Pb{X_2} < < Sn{X_2}$
D.
$Si{X_2} < < Ge{X_2} < < Sn{X_2} < < Pb{X_2}$
2007 Q253 JEE Mains MCQ
14 Mar 2026
Identify the incorrect statement among the following :
A.
Ozone reacts with SO2 to give SO3
B.
Silicon reacts with NaOH(aq) in the presence of air to give Na2SiO3 and H2O
C.
Cl2 reacts with excess of NH3 to give N2 and HCl
D.
Br2 reacts with hot and strong NaOH solution to give NaBr, NaBrO4 and H2O
2007 Q254 JEE Mains MCQ
14 Mar 2026
Regular use of which of the following fertilizer increases the acidity of soil?
A.
Potassium nitrate
B.
Urea
C.
Superphosphate of lime
D.
Ammonium sulphate
2006 Q255 JEE Mains MCQ
14 Mar 2026
Which of the following statements is true?
A.
H3PO3 is a stronger acid than H2SO3
B.
In aqueous medium HF is a stronger acid than HCl
C.
HClO4 is a weaker acid than HClO3
D.
HNO3 is a stronger acid than HNO2
2006 Q256 JEE Mains MCQ
14 Mar 2026
What products are expected from the disproportionation reaction of hypochlorous acid?
A.
HClO3 and Cl2O
B.
HClO2 and HClO4
C.
HCl and Cl2O
D.
HCl and HClO3
2005 Q257 JEE Mains MCQ
14 Mar 2026
The number of hydrogen atom(s) attached to phosphorus atom in hypophosphorous acid is :
A.
zero
B.
two
C.
one
D.
three
2005 Q258 JEE Mains MCQ
14 Mar 2026
In silicon dioxide :
A.
Each silicon atom is surrounded by four oxygen atoms and each oxygen atom is bonded to two silicon atoms
B.
Each silicon atom is surrounded by two oxygen atoms and each oxygen atom is bonded to two silicon atoms
C.
Silicon atoms is bonded to two oxygen atoms
D.
there are double bonds between silicon and oxygen atoms
2005 Q259 JEE Mains MCQ
14 Mar 2026
The structure of diborane (B2H6) contains :
A.
four 2c-2e bonds and two 3c-2e bonds
B.
two 2c-2e bonds and four 3c-2e bonds
C.
two 2c-2e bonds and two 3c-3e bonds
D.
four 2c-2e bonds and four 3c-2e bonds
2005 Q260 JEE Mains MCQ
14 Mar 2026
The correct order of the thermal stability of hydrogen halides (H – X) is :
A.
HI > HBr > HCl > HF
B.
HF > HCl > HBr > HI
C.
HCl < HF > HBr < HI
D.
HI > HCl < HF < HBr
2005 Q261 JEE Mains MCQ
14 Mar 2026
Heating an aqueous solution of aluminium chloride to dryness will give :
A.
AlCl3
B.
Al2Cl6
C.
Al2O3
D.
Al(OH)Cl2
2004 Q262 JEE Mains MCQ
14 Mar 2026
Aluminium chloride exists as dimer, Al2Cl6 in solid state as well as in solution of non-polar solvents such as benzene. When dissolved in water, it gives :
A.
Al3+ + 3Cl-
B.
Al2O3 + 6HCl
C.
[Al(OH)6]3-
D.
[Al(H2O)6]3+ + 3Cl-
2004 Q263 JEE Mains MCQ
14 Mar 2026
Which among the following factors is the most important in making fluorine the strongest oxidizing halogen?
A.
Electron affinity
B.
Bond dissociation energy
C.
Hydration enthalpy
D.
Ionization enthalpy
2004 Q264 JEE Mains MCQ
14 Mar 2026
Beryllium and aluminium exhibit many properties which are similar. But the two elements differ in :
A.
exhibiting maximum covalency in compound
B.
exhibiting amphoteric nature in their oxides
C.
forming covalent halides
D.
forming polymeric hydrides
2004 Q265 JEE Mains MCQ
14 Mar 2026
The soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttons got converted to grey power. The transformation is related to :
A.
a change in the partial pressure of oxygen in the air
B.
a change in the crystalline structure of tin
C.
an interaction with nitrogen of the air at very low temperature
D.
an interaction with water vapor contained in the humid air
2004 Q266 JEE Mains MCQ
14 Mar 2026
Which one the following statement regarding helium is incorrect?
A.
It is used to fill gas balloons instead of hydrogen because it is lighter and non–inflammable
B.
It is used in gas – cooled nuclear reactors
C.
It is used to produce and sustain powerful superconducting reagents
D.
It is used as cryogenic agent for carrying out experiments at low temperatures
2003 Q267 JEE Mains MCQ
14 Mar 2026
Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. The explanation for it is that :
A.
oxygen in air reacts with the emitted HCI gas to form a cloud of chlorine gas
B.
strong affinity of HCI gas for moisture in air results in forming of droplets of liquid solution which appears like a cloudy smoke
C.
due to strong affinity for water, concentrated hydrochloric acid pulls moisture of air towards it self. This moisture forms droplets of water and hence the cloud.
D.
concentrated hydrochloric acid emits strongly smelling HCI gas all the time.
2003 Q268 JEE Mains MCQ
14 Mar 2026
Glass is a :
A.
super-cooled liquid
B.
gel
C.
polymeric mixture
D.
micro-crystalline solid
2003 Q269 JEE Mains MCQ
14 Mar 2026
Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite :
A.
is an allotropic form of diamond
B.
has molecules of variable molecular masses like polymers
C.
has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds
D.
is a non-crystalline substance
2003 Q270 JEE Mains MCQ
14 Mar 2026
What may be expected to happen when phosphine gas is mixed with chlorine gas?
A.
PCI3 and HCI are formed and the mixture warms up
B.
PCI5 and HCI are formed and the mixture cools down
C.
PH3.Cl2 is formed with warming up
D.
The mixture only cools down
2003 Q271 JEE Mains MCQ
14 Mar 2026
Which one of the following substances has the highest proton affinity?
A.
H2S
B.
NH3
C.
PH3
D.
H2O
2002 Q272 JEE Mains MCQ
14 Mar 2026
In XeF2, XeF4, XeF6 the number of lone pairs of Xe are respectively :
A.
2, 3, 1
B.
1, 2, 3
C.
4, 1, 2
D.
3, 2, 1
2002 Q273 JEE Mains MCQ
14 Mar 2026
Number of sigma bonds in P4O10 is :
A.
6
B.
7
C.
17
D.
16
2002 Q274 JEE Mains MCQ
14 Mar 2026
In case of nitrogen, NCl3 is possible but not NCl5 while in case of phosphorous, PCl3 as well as PCl5 are possible. It is due to :
A.
availability of vacant d orbitals in P but not in N
B.
lower electronegativity of P than N
C.
lower tendency of H - bond formation in P than N
D.
occurrence of P in solid while N in gaseous state at room temperature
2002 Q275 JEE Mains MCQ
14 Mar 2026
When H2S is passed through Hg2S we get :
A.
HgS
B.
HgS + Hg2S
C.
Hg2S
D.
Hg2S2
2002 Q276 JEE Mains MCQ
14 Mar 2026
Oxidation number of Cl in CaOCl2 (bleaching powder) is :
A.
zero, since it contains Cl2
B.
-1, since it contains Cl-
C.
+1, since it contains ClO-
D.
+1 and -1 since it contains ClO- and Cl-