JEE Main PYQs — p-Block Elements (Class 12)

Consider the following elements In, Tl, Al, Pb, Sn and Ge. The most stable oxidation states of elements with highest and lowest first ionisation enthalpies, respectively, are:

The group 14 elements A and B have the first ionisation enthalpy values of 708 and 715 kJ mol-1 respectively. The above values are lowest among their group members. The nature of their ions A2+ and…

When a salt is treated with sodium hydroxide solution it gives gas X. On passing gas X through reagent Y a brown coloured precipitate is formed. X and Y respectively, are

The amphoteric oxide among V2O3, V2O4 and V2O5 upon reaction with alkali leads to formation of an oxide anion. The oxidation state of V in the oxide anion is: (a) +3 (b) +7 (c) +5 (d) +4

The large difference between the melting and boiling points of oxygen and sulphur may be explained on the basis of: (a) Atomic size (b) Atomicity (c) Electronegativity (d) Electron gain enthalpy

The strongest reducing agent among the following is:

Given below are two statements: Statement-I: Noble gases have very high boiling points. Statement-II: Noble gases are monoatomic gases. They are held together by strong dispersion forces. Because of…

Element not showing variable oxidation state is:

Identify the incorrect statements about group 15 elements: (A) Dinitrogen is a diatomic gas which acts like an inert gas at room temperature. (B) The common oxidation states of these elements are -3,…

Choose the correct statements about the hydrides of group 15 elements. A. The stability of the hydrides decreases in the order NH3 > PH3 > AsH3 > SbH3 > BiH3 B. The reducing ability of the hydrides…

On reaction of Lead Sulphide with dilute nitric acid which of the following is not formed?

Choose the correct statements from the following: A. All group 16 elements form oxides of general formula EO2 and EO3 where E = S, Se, Te and Po. Both the types of oxides are acidic in nature. B.…

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Both rhombic and monoclinic sulphur exist as S8 while oxygen exists as O2.…

Anomalous behaviour of oxygen is due to its

Given below are two statements: Statement (I): Oxygen being the first member of group 16 exhibits only -2 oxidation state. Statement (II): Down the group 16 stability of +4 oxidation state decreases…

Match List I with List II | | List I (Oxide) | | List II (Type of bond) | |---|---|---|---| | A | N2O4 | I | 1\,N=O bond | | B | NO2 | II | 1\,N-O-N bond | | C | N2O5 | III | 1\,N-N bond | | D | N2O…

The incorrect statement from the following for borazine is:

The number of P-O-P bonds in H4P2O7, (HPO3)3, and P4O10 are respectively

Inert gases have positive electron gain enthalpy. Its correct order is

An ammoniacal metal salt solution gives a brilliant red precipitate on addition of dimethylglyoxime. The metal ion is:

A chloride salt solution acidified with dil. HNO3 gives a curdy white precipitate, [A], on addition of AgNO3. [A] on treatment with NH4OH gives a clear solution, B. A and B respectively are:

Given below are two statements: Statement-I: Methane and steam passed over a heated Ni catalyst produces hydrogen gas. Statement-II: Sodium nitrite reacts with NH4Cl to give H2O, N2 and NaCl. In the…

Compound A reacts with NH4Cl and forms a compound B. Compound B reacts with H2O and excess of CO2 to form compound C which on passing through or reaction with saturated NaCl solution forms sodium…

"A" obtained by Ostwald's method involving air oxidation of NH3, upon further air oxidation produces "B". "B" on hydration forms an oxoacid of Nitrogen along with evolution of "A". The oxoacid also…

Which of the Phosphorus oxoacid can create silver mirror from AgNO3 solution?

Reaction of thionyl chloride with white phosphorus forms a compound [A], which on hydrolysis gives [B], a dibasic acid. [A] and [B] are respectively

One mole of P4 reacts with 8 moles of SOCl2 to give 4 moles of A, x mole of SO2 and 2 moles of B. A, B and x respectively are

The correct group of halide ions which can be oxidised by oxygen in acidic medium is

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: A solution of the product obtained by heating a mole of glycine with a mole of…

Identify X, Y and Z in the following reaction. (Equation not balanced) {ClO + NO_2 {X} {H_2O} {Y} + {Z}}

Given below are two statements: Statement I: Chlorine can easily combine with oxygen to form oxides; and the product has a tendency to explode. Statement II: Chemical reactivity of an element can be…

The difference between electron gain enthalpies will be maximum between:

The incorrect statement regarding the reaction given below is

When Cu2+ ion is treated with KI, a white precipitate, X appears in solution. The solution is titrated with sodium thiosulphate, the compound Y is formed. X and Y respectively are

Bond dissociation energy of E-H bond of the H2E hydrides of group 16 elements follows order: (A) O (B) S (C) Se (D) Te

The most stable trihalide of nitrogen is.

Dinitrogen and dioxygen the main constituents of air do not react with each other in atmosphere to form oxides of nitrogen because

PCl5 is well known but NCl5 is not. Because,

Match List-I with List-II. | | List-I | | List-II | |---|---|---|---| | A | 4NH3(g) + 5O2(g) 4NO(g) + 6H2O(g) | I | NO(g) | | B | N2(g) + 3H2(g) 2NH3(g) | II | H2SO4(l) | | C | C12H22O11(aq) + H2O(l)…

White phosphorus reacts with thionyl chloride to give

Which one of the following elemental forms is not present in the enamel of the teeth?

Nitrogen gas is obtained by thermal decomposition of:

Among the given oxides of nitrogen; N2O, N2O3, N2O4 and N2O5, the number of compound(s) having N–N bond is

The total number of acidic oxides from the following list is: NO,\ N2O,\ B2O3,\ N2O5,\ CO,\ SO3,\ P4O10

The gas produced by treating an aqueous solution of ammonium chloride with sodium nitrite is

Dinitrogen is a robust compound, but reacts at high altitude to form oxides. The oxide of nitrogen that can damage plant leaves and retard photosynthesis is

Given below are the oxides: Na2O,\ As2O3,\ N2O,\ NO and Cl2O7 Number of amphoteric oxides is:

Concentrated HNO3 reacts with Iodine to give

Match List-I with List-II, match the gas evolved during each reaction. | | List-I | | List-II | |---|---|---|---| | A | (NH4)2Cr2O7 | I | H2 | | B | KMnO4 + HCl | II | N2 | | C | Al + NaOH + H2O |…

Which oxoacid of phosphorous has the highest number of oxygen atoms present in its chemical formula?

Given below are two statements: Statement I: The pentavalent oxide of group-15 element, E2O5, is less acidic than trivalent oxide, E2O3, of the same element. Statement II: The acidic character of…

Consider the following reaction: A + alkali B (Major Product) If B is an oxoacid of phosphorus with no P–H bond, then A is

Heating white phosphorus with conc. NaOH solution gives mainly

The oxoacid of phosphorus that is easily obtained from a reaction of alkali and white phosphorus and has two P–H bonds, is

Which of the following oxoacids of sulphur contains "S" in two different oxidation states?

The correct order of melting points of hydrides of group 16 elements is

On the surface of polar stratospheric clouds, hydrolysis of chlorine nitrate gives A and B while its reaction with HCl produces B and C. A, B and C are, respectively

Polar stratospheric clouds facilitate the formation of

Given below are two statements: one is labelled as Assertion and the other is labelled as Reason. Assertion: Fluorine forms one oxoacid. Reason: Fluorine has smallest size amongst all halogens and is…

Consider the following reaction: {2HSO_4^-(aq) {{(1) Electrolysis, (2) Hydrolysis}} 2HSO_4^- + 2H^+ + A} The dihedral angle in product A in its solid phase at 110 K is

The interhalogen compound formed from the reaction of bromine with excess of fluorine is a

Which one of the following group-15 hydride is the strongest reducing agent?

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

Match List-I with List-II: | | List-I (Industrial process) | | List-II (Application) | |---|---|---|---| | (a) | Haber's process | (i) | HNO3 synthesis | | (b) | Ostwald's process | (ii) | Aluminium…

Chalcogen group elements are:

Match List-I with List-II: | | List-I (Species) | | List-II (Number of lone pairs on central atom) | |---|---|---|---| | (a) | XeF2 | (i) | 0 | | (b) | XeO2F2 | (ii) | 1 | | (c) | XeO3F2 | (iii) | 2…

The correct order of bond dissociation enthalpy of halogens is:

Chemical nature of the nitrogen oxide compound obtained from a reaction of concentrated nitric acid and P4O10 (in 4:1 ratio) is:

The oxide without nitrogen-nitrogen bond is:

Match List-I with List-II | | List-I (Name of oxoacid) | | List-II (Oxidation state of P) | |---|---|---|---| | (a) | Hypophosphorous acid | (i) | +5 | | (b) | Orthophosphoric acid | (ii) | +4 | |…

The number of non-ionisable hydrogen atoms present in the final product obtained from the hydrolysis of PCl5 is:

Which one of the following is formed (mainly) when red phosphorus is heated in a sealed tube at 803 K?

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

Given below are two statements: Statement I: and forms of sulphur can change reversibly between themselves with slow heating or slow cooling. Statement II: At room temperature the stable crystalline…

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:

The number of S=O bonds present in sulphurous acid, peroxodisulphuric acid and pyrosulphuric acid, respectively are:

The incorrect statement is:

FeX2 and FeY3 are known when x and y are:

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

Number of Cl=O bonds in chlorous acid, chloric acid and perchloric acid respectively are:

The difference in the oxidation state of Xe between the oxidised product of Xe formed on complete hydrolysis of XeF4 and XeF4 is

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

The reaction of NO with N2O4 at 250 K gives:

The correct statement with respect to dinitrogen is:

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:

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

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

Reaction of ammonia with excess Cl2 gives:

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…

The structure of PCl5 in the solid state is:

In a molecule of pyrophosphoric acid, the number of P-OH, P=O and P-O-P bonds/moiety(ies) respectively are:

Reaction of an inorganic sulphite X with dilute H2SO4 generated compound Y. Reaction of Y with NaOH gives X. Further, the reaction of X with Y and water affords compound Z. Y and X, respectively, are:

In the following reactions, products (A) and (B), respectively, are: {NaOH + Cl_2 (A) + {side products}}{(hot and conc.)} {Ca(OH)_2 + Cl_2 (B) + {side products}}{(dry)}

The correct order of the oxidation states of nitrogen in NO, N2O, NO2 and N2O3 is

Among the following reactions of hydrogen with halogens, the one that requires a catalyst is:

Match the catalysts (Column I) with products (Column II) | | Column I (Catalyst) | | Column II (Product) | |---|---|---|---| | A. | V2O5 | P. | Polyethylene | | B. | TiCl4/Al(Me)3 | Q. | Ethanal | |…

HF has highest boiling point among hydrogen halides, because it has:

Iodine reacts with concentrated HNO3 to yield Y along with other products. The oxidation state of iodine in Y, is:

Sodium metal on dissolution in liquid ammonia gives a deep blue solution due to the formation of:

The pair that contains two P–H bonds in each of the oxoacids is:

Good reducing nature of H3PO2 is attributed to the presence of:

The oxoacid of sulphur that does not contain bond between sulphur atom is:

The chloride that CANNOT get hydrolysed is:

Chlorine on reaction with hot and concentrated sodium hydroxide gives.

The ion that has sp3d2 hybridization for the central atom is:

The correct statement about ICl5 and ICl4- is: