p-Block Elements — JEE Main PYQs

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : In $Tl{I}_3$, isomorphous to $Cs{I}_3$, the metal is present in +1 oxidation state.
Reason R : Tl metal has fourteen f electrons in the electronic configuratio …

Which pair of oxides is acidic in nature?

Which one of the following correctly represents the order of stability of oxides, X₂O; (X = halogen)?

The number of $\mathrm{S}=\mathrm{O}$ bonds present in sulphurous acid, peroxodisulphuric acid and pyrosulphuric acid, respectively are :

The major component/ingredient of Portland Cement is :

The number of halogen/(s) forming halic (V) acid is ____ .

The product obtained from the electrolytic oxidation of acidified sulphate solutions, is:

The reaction of white phosphorous on boiling with alkali in inert atmosphere resulted in the formation of product 'A'. The reaction of 1 mol of 'A' with excess of ${\mathrm{AgNO}}_3$ in aqueous medium gives ______ $\mathrm{mol}(\mathrm{s})$ of Ag.
(Round off to the nearest intege …

Which one of the following compounds of Group-14 elements is not known?

Number of $\mathrm{Cl}=\mathrm{O}$ bonds in chlorous acid, chloric acid and perchloric acid respectively are:

The oxide without nitrogen-nitrogen bond is:

Match List - I with List - II:

List - I (Industrial process)
(a) Haber's process
(b) Ostwald's process
(c) Contact process
(d) Hall-Heroult process

List - II (Application)
(i) $\mathrm{HNO}{}_3$ synthesis
(ii) Aluminium extraction
(iii) $\mathrm{NH}{}_3$ synthesis
(iv) $\mathrm{H}{}_2\mathrm{SO}{}_4$ synthesis …

Match List - I with List - II

List - I
Name of oxo acid
(a) Hypophosphorous acid
(b) Orthophosphoric acid
(c) Hypophosphoric acid
(d) Orthophosphorous acid

List - II
Oxidation state of "P"
(i) +5
(ii) +4
(iii) +3
(iv) +2
(v) +1

Choose the correct answer from the options given …

A group 15 element, which is a metal and forms a hydride with strongest reducing power among group 15 hydrides. The element is:

The INCORRECT statement regarding the structure of ${\mathrm{C}}_{60}$ is:

A xenon compound 'A' upon partial hydrolysis gives ${\mathrm{XeO}}_2{\mathrm{F}}_2$. The number of lone pair of electrons present in compound $A$ is ____. (Round off to the nearest integer).

The set that represents the pair of neutral oxides of nitrogen is:

The chemical that is added to reduce the melting point of the reaction mixture during the extraction of aluminium is:

The number of ionisable hydrogens present in the product obtained from a reaction of phosphorus trichloride and phosphonic acid is:

Chlorine reacts with hot and concentrated NaOH and produces compound $(\mathrm{X})$ and $(\mathrm{Y})$. Compound(X) gives white precipitate with silver nitrate solution. The average bond order between Cl and O atoms in $(\mathrm{Y})$ is

In the following reactions, products(A) and (B) respectively are …

The number of bonds between sulphur and oxygen atoms in ${\mathrm{S}}_2{\mathrm{O}}_8^{-}$ and the number of bonds between sulphur and sulphur atoms in rhombic sulphur, respectively, are:

White phosphorus on reaction with concentrated NaOH solution in an inert atmosphere of ${\mathrm{CO}}_2$ gives phosphine and compound $(\mathrm{X})$. $(\mathrm{X})$ on acidification with HCl gives compound $(\mathrm{Y})$. The basicity of compound $(\mathrm{Y})$ is :

The reaction of ${\mathrm{H}}_3{\mathrm{N}}_3{\mathrm{B}}_3{\mathrm{Cl}}_3(\mathrm{A})$ with ${\mathrm{LiBH}}_4$ in tetrahydrofuran gives inorganic benzene (B). Further, the reaction of (A) with (C) leads to ${\mathrm{H}}_3{\mathrm{N}}_3{\mathrm{B}}_3(\mathrm{Me}{)}_3$. …

Reaction of ammonia with excess ${\mathrm{Cl}}_2$ gives:

Aqua regia is used for dissolving noble metals (Au, Pt, etc.). The gas evolved in this process is:

In a molecule of pyrophosphoric acid, the number of $\mathrm{P}-\mathrm{OH},\mathrm{P}=\mathrm{O}$ and $\mathrm{P}-\mathrm{O}-\mathrm{P}$ bonds/ moiety(ies) respectively are

The reaction of NO with ${\mathrm{N}}_2{\mathrm{O}}_4$ at 250 K gives:

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:

The structure of ${\mathrm{PCl}}_5$ in the solid state is:

The correct statement with respect to dinitrogen is:

The present of soluble fluoride ion upto 1 ppm concentration in drinking water, is:

The number of $\mathrm{Cl}=\mathrm{O}$ bonds in perchloric acid is," ____".

Diborane $\left({\mathrm{B}}_2{\mathrm{H}}_6\right)$ reacts independently with ${\mathrm{O}}_2$ and ${\mathrm{H}}_2\mathrm{O}$ to produce, respectively:

${\mathrm{C}}_{60}$, an allotrope of carbon contains:

The relative stability of +1 oxidation state of group 13 elements follows the order:

The correct statement among the following is

The basic structural unit of feldspar, zeolites, mica and asbestos is :

The noble gas that does NOT occur in the atmosphere is:

The number of pentagons in ${\mathrm{C}}_{60}$ and trigons (triangles) in white phosphorus, respectively, are:

The chloride that CANNOT get hydrolysed is

The $\mathrm{C}-\mathrm{C}$ bond length is maximum in

The element that does NOT show catenation is :

Chlorine on reaction with hot and concentrated sodium hydroxide gives :

The element that shows greater ability to form $p\pi -p\pi$ multiple bonds, is:

The amorphous form of silica is:

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 thallium are basic

Good reducing nature of ${\mathrm{H}}_3{\mathrm{PO}}_2$ is attributed to the presence of

The one that is extensively used as a piezoelectric material is

Correct statements among a to d regarding silicones are
(i) they are polymers with hydrophobic character
(ii) they are biocompatible
(iii) in general, they have high thermal stability and low dielectric strength
(iv) usually they are resistant to oxidation and used as greases.