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JEE • CHEMISTRY • P-BLOCK ELEMENTS

P-block elements practice · Easy

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Showing 91-120 of 344 questions

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91 Easy
91 of 344
Remembering +4 | -1
Which of the following is called Berthelot’s salt?
View answer and explanation
Correct option: C
KClO3KCl{O_3}
Option C (KClO3KCl{O_3}) is correct because potassium chlorate (KClO3KCl{O_3}) is commonly known as Berthelot's salt.
92 Easy
92 of 344
Understanding +4 | -1
Phosphorus pentoxide cannot be used to dry:
View answer and explanation
Correct option: B
Ammonia
Option B (Ammonia) is correct because phosphorus pentoxide reacts with ammonia.
93 Easy
93 of 344
Analyzing +4 | -1
Assertion (A): N2\mathrm{N}_2 is more stable than N2+\mathrm{N}_2^{+}.
Reason (R): Bond order of N2\mathrm{N}_2 is 2.5 while N2+\mathrm{N}_2^+ is 3.
View answer and explanation
Correct option: C
Assertion (A) is true, but Reason (R) is false
Option C (Assertion (A) is true, but Reason (R) is false) is correct because N2 is indeed more stable than N2+, but the bond order values provided in the reason are incorrect.
94 Easy
94 of 344
Understanding +4 | -1
Which substance chars when warmed with conc. H2SO4{H_2}S{O_4} ?
View answer and explanation
Correct option: D
Carbohydrate
Option D (Carbohydrate) is correct because concentrated H2SO4{H_2}S{O_4} is a strong dehydrating agent and removes water from carbohydrates, leaving behind carbon.
95 Easy
95 of 344
Remembering +4 | -1
Collectively the elements of group 15 are called -
View answer and explanation
Correct option: A
Pnicogens
Option A (Pnicogens) is correct because group 15 elements are collectively known as pnicogens.
96 Easy
96 of 344
Remembering +4 | -1
Noble gases are group of elements which exhibit very
View answer and explanation
Correct option: D
Low chemical activity
Option D (Low chemical activity) is correct because noble gases have a full valence shell, making them very stable and unreactive.
97 Easy
97 of 344
Remembering +4 | -1
In Kipp’s apparatus, H2S{\mathrm{H}_2}\mathrm{S} is prepared:
View answer and explanation
Correct option: C
By  FeS+dil.  H2SO4\mathrm{By\;FeS} + \mathrm{dil}.\mathrm{\;}{\mathrm{H}_2}\mathrm{S}{\mathrm{O}_4}
Option C (By  FeS+dil.  H2SO4\mathrm{By\;FeS} + \mathrm{dil}.\mathrm{\;}{\mathrm{H}_2}\mathrm{S}{\mathrm{O}_4}) is correct because Kipp's apparatus uses the reaction between ferrous sulfide (FeS) and dilute sulfuric acid to produce H2S gas.
98 Easy
98 of 344
Remembering +4 | -1
Noble gases are used in discharge tubes to gives different colours. Reddish orange glow is due to
View answer and explanation
Correct option: B
Ne{Ne}
Option B (Ne{Ne}) is correct because Neon gas is used in discharge tubes to produce a reddish-orange glow.
99 Easy
99 of 344
Remembering +4 | -1
The noble gas used in the preparation of first noble gas compound was:
View answer and explanation
Correct option: A
Xe
Option A (Xe) is correct because xenon was the first noble gas used to prepare a stable noble gas compound, specifically XePtF6XePtF_6.
100 Easy
100 of 344
Remembering +4 | -1
Poison for platinum, a catalyst in contact process of H2SO4{H_2}S{O_4} is:
View answer and explanation
Correct option: C
As
Option C (As) is correct because arsenic (As) is a known poison for platinum catalysts used in the contact process for sulfuric acid production.
101 Easy
101 of 344
Remembering +4 | -1
Compound of Sulphur used in electrical transformer is:
View answer and explanation
Correct option: D
SF6S{F_6}
Option D (SF6S{F_6}) is correct because sulfur hexafluoride is chemically inert and used as an insulator in electrical transformers.
102 Easy
102 of 344
Understanding +4 | -1
Polyanion formation is maximum in
View answer and explanation
Correct option: B
Sulphur
The correct answer is Sulphur because sulphur exhibits catenation to a greater extent than other elements in the given options, leading to maximum polyanion formation.
103 Easy
103 of 344
Remembering +4 | -1
Mixture used in Holme’s signals is
View answer and explanation
Correct option: C
CaC2+Ca3P2Ca{C_2} + C{a_3}{P_2}
Option C (CaC2+Ca3P2Ca{C_2} + C{a_3}{P_2}) is correct because the mixture of calcium carbide and calcium phosphide produces acetylene and phosphine, which ignite spontaneously and produce a visible flame.
104 Easy
104 of 344
Remembering +4 | -1
The noble gas used in atomic reactor ,is
View answer and explanation
Correct option: D
Helium
Option D (Helium) is correct because helium is a noble gas often used in atomic reactors due to its inertness, high thermal conductivity, and low neutron absorption cross-section.
105 Easy
105 of 344
Remembering +4 | -1
Which of the following is pseudohalogen?
View answer and explanation
Correct option: B
(CN)2{\left( {CN} \right)_2}
Option B ((CN)2{\left( {CN} \right)_2}) is correct because dicyanogen ((CN)2{\left( {CN} \right)_2}) exhibits properties similar to halogens and is thus classified as a pseudohalogen.

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106 Easy
106 of 344
Remembering +4 | -1
The poisson’s ratio for inert gases is:
View answer and explanation
Correct option: B
1.66
Option B (1.66) is correct because inert gases are monatomic, and for monatomic gases, the ratio of specific heats (γ = Cp/Cv) is approximately 1.66.
107 Easy
107 of 344
Remembering +4 | -1
Which of the following elements is good conductor of electricity?
View answer and explanation
Correct option: C
Bi
Option C (Bi) is correct because Bismuth is a metal and metals are generally good conductors of electricity.
108 Easy
108 of 344
Understanding +4 | -1
Which of the following inert gas liquefies easily?
View answer and explanation
Correct option: B
Kr\mathrm{Kr}
Option B (Kr\mathrm{Kr}) is correct because Krypton has the highest boiling point among the given noble gases, indicating stronger intermolecular forces and easier liquefaction.
109 Easy
109 of 344
Remembering +4 | -1
Which of the following halogens is solid at room temperature?
View answer and explanation
Correct option: A
Iodine
Option A (Iodine) is correct because iodine is a solid at room temperature, while fluorine and chlorine are gases, and bromine is a liquid.
110 Easy
110 of 344
Understanding +4 | -1
How many lone pair of electrons are present on XeXe in XeOF4XeO{F_4} ?
View answer and explanation
Correct option: A
1
Option B (2) is correct because a 3p orbital has one angular node (l=1) and one radial node (n-l-1 = 3-1-1 = 1).
111 Easy
111 of 344
Analyzing +4 | -1
Assertion (A): The fluorine has lower reactivity.

Reason (R): F−F{F}-F bond in F2{F}_2 molecule is weak.
View answer and explanation
Correct option: D
(A) is false and (R) is true
Option D ((A) is false and (R) is true) is correct because fluorine is highly reactive, and the F-F bond is weak due to the small size and high interelectronic repulsion.
112 Easy
112 of 344
Analyzing +4 | -1
A gas reacts with CaO\mathrm{CaO}, but not with NaHCO3\mathrm{NaHC}{\mathrm{O}_3}. The gas is:
View answer and explanation
Correct option: B
Cl2\mathrm{C}{\mathrm{l}_2}
Option B is correct because Cl2 reacts with CaO to form calcium chloride and calcium hypochlorite, but does not react with NaHCO3.
113 Easy
113 of 344
Remembering +4 | -1
Clathrates are
View answer and explanation
Correct option: A
Non-stoichiometric compounds
Option A (Non-stoichiometric compounds) is correct because clathrates are non-stoichiometric compounds where the ratio of guest and host molecules does not correspond to an ideal chemical formula.
114 Easy
114 of 344
Understanding +4 | -1
Assertion (A) : O2\mathrm{O}_2 gas is effected in magnetic field.

Reason (R) : It has north and south pole.
View answer and explanation
Correct option: C
A\mathbf{A} is true but R\mathbf{R} is false.
Option C (A\mathbf{A} is true but R\mathbf{R} is false) is correct because oxygen gas is paramagnetic and is attracted to magnetic fields due to the presence of unpaired electrons, but it does not have fixed north and south poles.
115 Easy
115 of 344
Remembering +4 | -1
The gas used in gas thermometer is:
View answer and explanation
Correct option: A
HeHe
Option A (HeHe) is correct because helium is an inert gas with a low boiling point, making it suitable for use in gas thermometers over a wide temperature range.
116 Easy
116 of 344
Remembering +4 | -1
The fertilizer named ‘Nitrolim’ is prepared by the use of :
View answer and explanation
Correct option: D
CaC2+N2Ca{C_2} + {N_2}
Option D (CaC2+N2Ca{C_2} + {N_2}) is correct because Nitrolim (CaCN2CaCN_2) is produced by reacting calcium carbide (CaC2CaC_2) with nitrogen gas (N2N_2).
117 Easy
117 of 344
Remembering +4 | -1
Nitrogen forms …. Oxides.
View answer and explanation
Correct option: C
5
Option C (5) is correct because nitrogen forms five stable oxides: N₂O, NO, N₂O₃, N₂O₄, and N₂O₅.
118 Easy
118 of 344
Remembering +4 | -1
The increasing order of reactivity of halogens is:
View answer and explanation
Correct option: A
I2<Br2<Cl2<F2{I_2} < B{r_2} < C{l_2} < {F_2}
Option A (I2<Br2<Cl2<F2{I_2} < B{r_2} < C{l_2} < {F_2}) is correct because the reactivity of halogens decreases down the group, with fluorine being the most reactive and iodine being the least reactive.
119 Easy
119 of 344
Remembering +4 | -1
The first noble gas compound obtained was:
View answer and explanation
Correct option: C
XePtF6XePt{F_6}
Option C (XePtF6XePt{F_6}) is correct because XePtF6XePtF_6 was the first noble gas compound synthesized, paving the way for further noble gas chemistry.
120 Easy
120 of 344
Understanding +4 | -1
Most acidic compound among the following is
View answer and explanation
Correct option: D
H2 S{H}_2 {~S}
Option D (H2 S{H}_2 {~S}) is correct because as we go down the group, the acidity increases due to the decrease in bond dissociation energy.
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