JEE Main
Chemistry
p-Block Elements
Previous Years Questions

The correct order of bond enthalpy ($$\mathrm{kJ~mol^{-1}}$$) is :
For electron gain enthalpies of the elements denoted as $$\Delta_{\mathrm{eg}} \mathrm{H}$$, the incorrect option is :
Highest oxidation state of Mn is exhibited in $$\mathrm{Mn_2O_7}$$. The correct statements about $$\mathrm{Mn_2O_7}$$ are (A) Mn is tetrahedrally surr...
The Lewis acid character of boron tri halides follows the order :
Given below are two statements : Statement I: Upon heating a borax bead dipped in cupric sulphate in a luminous flame, the colour of the bead becomes ...
The correct order of basicity of oxides of vanadium is
Identify X, Y and Z in the following reaction. (Equation not balanced) ...
Boric acid is solid, whereas $\mathrm{BF}_3$ is gas at room temperature because of
The set of correct statements is : (i) Manganese exhibits +7 oxidation state in its oxide. (ii) Ruthenium and Osmium exhibit +8 oxidation in their oxi...
During the borax bead test with $$\mathrm{CuSO_4}$$, a blue green colour of the bead was observed in oxidising flame due to the formation of
"A" obtained by Ostwald's method involving air oxidation of NH$$_3$$, upon further air oxidation produces "B", "B" on hydration forms an oxoacid of Ni...
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R Assertion A : Carbon forms two important oxides -...
A. Ammonium salts produce haze in atmosphere. B. Ozone gets produced when atmospheric oxygen reacts with chlorine radicals. C. Polychlorinated bipheny...
Potassium dichromate acts as a strong oxidizing agent in acidic solution. During this process, the oxidation state changes from
Reaction of thionyl chloride with white phosphorus forms a compound [A], which on hydrolysis gives [B], a dibasic acid. [A] and [B] are respectively...
Match the List-I with List-II : .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-...
Compound A reacts with NH$$_4$$Cl and forms a compound B. Compound B reacts with H$$_2$$O and excess of CO$$_2$$ to form compound C which on passing t...
$$\mathrm{K_2Cr_2O_7}$$ paper acidified with dilute $$\mathrm{H_2SO_4}$$ turns green when exposed to
Which of the following is true about freons?
Which of the Phosphorus oxoacid can create silver mirror from $$\mathrm{AgNO_3}$$ solution?
When borax is heated with $$\mathrm{CoO}$$ on a platinum loop, blue coloured bead formed is largely due to
Dinitrogen is a robust compound, but reacts at high altitudes to form oxides. The oxide of nitrogen that can damage plant leaves and retard photosynth...
White phosphorus reacts with thionyl chloride to give
Dinitrogen and dioxygen, the main constituents of air do not react with each other in atmosphere to form oxides of nitrogen because
Match List - I with List - II, match the gas evolved during each reaction. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:blac...
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Boron is unable to form $$\... Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Activated charcoal adsorbs SO2 mor... Given below are two statements. Statement I: The chlorides of$$\mathrm{Be}$$and$$\mathrm{Al}$$have Cl-bridged structure. Both are soluble in organ... Which oxoacid of phosphorous has the highest number of oxygen atoms present in its chemical formula? Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion : Boric acid is a weak acid. Reason R... Match List - I with List - II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-f... Borazine, also known as inorganic benzene, can be prepared by the reaction of 3-equivalents of "$$X$$" with 6-equivalents of "$$Y$$". "$$X$$" and "$$Y...
The total number of acidic oxides from the following list is NO, N2O, B2O3, N2O5, CO, SO3, P4O10...
Match List I with List II: .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-famil...
The geometry around boron in the product 'B' formed from the following reaction is \begin{aligned} &\mathrm{BF}_{3}+\mathrm{NaH} \stackrel{450 \mat... The interhalogen compound formed from the reaction of bromine with excess of fluorine is a : A\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{}^{573\,K}} $$Red phosphorus$$\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{under\,press...
Aqueous solution of which of the following boron compounds will be strongly basic in nature?
Sulphur dioxide is one of the components of polluted air. SO2 is also a major contributor to acid rain. The correct and complete reaction to represent...
A white precipitate was formed when BaCl2 was added to water extract of an inorganic salt. Further, a gas 'X' with characteristic odour was released w...
The oxoacid of phosphorus that is easily obtained from a reaction of alkali and white phosphorus and has two P-H bonds, is :
Match List - I with List - II : .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-...
Among the given oxides of nitrogen ; N2O, N2O3, N2O4 and N2O5, the number of compound/(s) having N - N bond is :...
Which of the following oxoacids of sulphur contains "S" in two different oxidation states?
Nitrogen gas is obtained by thermal decomposition of
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...
The gas produced by treating an aqueous solution of ammonium chloride with sodium nitrite is
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Fluorine forms one oxoacid. Reaso...
Match List I with List II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-famil...
Match List - I with List - II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-f...
Heating white phosphorus with conc. NaOH solution gives mainly:
Which of the following elements is considered as a metalloid?
The oxide which contains an odd electron at the nitrogen atom is
Choose the correct stability order of group 13 elements in their + 1 oxidation state.
The correct order of melting points of hydrides of group 16 elements is :
Consider the following reaction : A + alkali $$\to$$ B (Major Product) If B is an oxoacid of phosphorus with no P-H bond, then A is :...
The number of bridged oxygen atoms present in compound B formed from the following reactions is Pb(NO3)2 $$\buildrel {673\,K} \over \longrightarrow ... White precipitate of AgCl dissolves in aqueous ammonia solution due to formation of : PCl5 is well known, but NCl5 is not. because, Given below are the oxides: Na2O, As2O3, N2O, NO and Cl2O7 Number of amphoteric oxides is :... The most stable trihalide of nitrogen is : Which one of the following elemental forms is not present in the enamel of the teeth? The oxide without nitrogen-nitrogen bond is : The number of S = O bonds present in sulphurous acid, peroxodisulphuric acid and pyrosulphuric acid, respectively are : Which one of the following is formed (mainly) when red phosphorus is heated in a sealed tube at 803 K? In polythionic acid, H2SxO6 (x = 3 to 5) the oxidation state(s) of sulphur is/are : The number of non-ionisable hydrogen atoms present in the final product obtained from the hydrolysis of PCl5 is : Given below are two statement : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : SO2(g) is absorbed to a large ext... Match List - I with List - II : .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-f... Number of Cl = O bonds in chlorous acid, chloric acid and perchloric acid respectively are : The product obtained from the electrolytic oxidation of acidified sulphate solutions, is : 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(... Which one of the following group-15 hydride is the strongest reducing agent? The species given below that does NOT show disproportionation reaction is : Chemical nature of the nitrogen oxide compound obtained from a reaction of concentrated nitric acid and P4O10 (in 4 : 1 ratio) is :... Reagent, 1-napthylamine and sulphanilic acid in acetic acid is used for the detection of Match List - I with List - II List - I(process) List - II(catalyst) (a) Deacron's process (i) ZSM-5 ... The number of ionisable hydrogens present in the product obtained from a reaction of phosphorus trichloride and phosphonic acid is : The INCORRECT statement regarding the structure of C60 is : Match List - I with List - II : List - IIndustrial process List - IIApplication (a) Haber's process (i) ... A group of 15 element, which is a metal and forms a hydride with strongest reducing power among group 15 hydrides. The element is : Match List - I with List - II : List - I Name of oxo acid List - II Oxidation state of 'P' (a) Hypophosphorous a... Which pair of oxides is acidic in nature? 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...
Given below are two statements :Statement I : $$\alpha$$ and $$\beta$$ forms of sulphur can change reversibly between themselves with slow heating or ...
Which of the following compound is added to the sodium extract before addition of silver nitrate for testing of halogens?
The correct statement about B2H6 is :
The reaction of NO with N2O4 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 wat...
The correct statement with respect to dinitrogen is :
Boron and silicon of very high purity can be obtained through :
Reaction of ammonia with excess Cl2 gives :
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 t...
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 P - OH, P = O and P - O - P bonds/moiety(ies) respectively are :
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 (...
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...
White Phosphorus on reaction with concentrated NaOH solution in an inert atmosphere of CO2 gives phosphine and compound (X). (X) on acidification with...
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...
The C–C bond length is maximum in :
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 C60 and trigons (triangles) in white phosphorus, respectively, are :
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 am...
C60, an allotrope of carbon contains :
Diborane (B2H6) reacts with O2 and H2O independently, then products formed are
The element that does NOT show catenation is -
Iodine reacts with concentrated HNO3 to yield Y along with other products. The oxidation state of iodine in Y, is -
The chloride that CANNOT get hydrolysed is :
Among the following reactions of hydrogen with halogens, the one that requires a catalyst is
Good reducing nature of H3PO2 is attributed to the presence of :
Correct statements among a to d regarding silicones are : (a)   They are polymers with hydrophobic character. (b)   Th...
The one that is extensively used as a piezoelectric material is :
Among the oxides of nitrogen : N2O3, N2O4 and N2O5; the molecule(s) having nitrogen-nitrogen bond is / are : ...
A group 13 element 'X' reacts with chlorine gas to produce a compound XCl3. XCl3 is electron deficient and easily reacts with NH3 to form Cl3X $$\lef... The compound that does not produce nitrogen gas by the thermal decomposition is For per gram of reactant, the maximum quantity of N2 gas is produced in which of the following thermal decomposition reactions ? (Given : Atomic wt. ... In KO2, the nature of oxygen species and the oxydation state of oxygen atom are, respectively : In XeO3F2, the number of bond pair(s),$$\pi $$-bond(s) and lone pair(s) on Xe atom respectively are : In graphite and diamond, the percentage of p-characters of the hybrid orbitals in hybridisation are respectively : Xenon hexafluoride on partial hydrolysis produces compounds 'X' and 'Y' . Compounds 'X' and 'Y' and the oxidation state of Xe are respectively : XeF6 on partial hydrolysis with water produces a compound ‘X’. The same compound ‘X’ is formed when XeF6 reacts with silica. The compound ‘X’ is : ... The number of P−OH bonds and the oxidation state of phosphorus atom in pyrophosphoric acid (H4P2O7) respectively are : ... The correct sequence of decreasing number of$$\pi $$-bonds in the structures of H2SO3, H2SO4 and H2S2O7 is :... A metal ‘M’ reacts with nitrogen gas to afford ‘M3N’. ‘M3N’ on heating at high temperature gives back ‘M’ and on reaction with water produces a gas ‘B... The number of S = O and S − OH bonds present in peroxodisulphuric acid and pyrosulphuric acid respectively are : The products obtained when chlorine gas reacts with cold and dilute aqueous NaOH are: Aqueous solution of which salt will not contain ions with the electronic configuration 1s22s22p63s23p6 ?... Assertion : Among the carbon allotropes, diamond is an insulator, whereas, graphite is a good conductor of electricity. Reason... Identify the incorrect statement : Which intermolecular force is most responsible in allowing xenon gas to liquefy ? The non-metal that does not exhibit positive oxidation state is: Match the items in Column I with its main use listed in Column II : .tg {border-collapse:collapse;border-spacing:0;border-color:#999;width:100%} .tg... The pair in which phosphorous atoms have a formal oxidation state of +3 is: The reaction of zinc with dilute and concentrated nitric acid, respectively, produces: Which among the following is the most reactive? Which one has the highest boiling point? Assertion : Nitrogen and Oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen. Reason : The reaction bet... Among the following oxoacids, the correct decreasing order of acid strength is Which one of the following properties is not shown by NO? The correct statement for the molecule, CsI3 is: The molecule having smallest bond angle is : Which of the following statement is wrong ? Which of the following statements regarding sulphur is incorrect ? Boron cannot form which one of the following anions ? Which one of the following reactions of Xenon compounds is not feasible ? Which one of the following is the correct statement? Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is Regular use of which of the following fertilizer increases the acidity of soil? Identify the incorrect statement among the following The increasing order of the first ionization enthalpies of the elements B, P, S and F (lowest first) is Which of the following statements is true? What products are expected from the disproportionation reaction of hypochlorous acid? The number of hydrogen atom(s) attached to phosphorus atom in hypophosphorous acid is The correct order of the thermal stability of hydrogen halides (H – X) is In silicon dioxide Heating an aqueous solution of aluminium chloride to dryness will give The structure of diborane (B2H6) contains Beryllium and aluminium exhibit many properties which are similar. But the two elements differ in Which one the following statement regarding helium is incorrect? Which among the following factors is the most important in making fluorine the strongest oxidizing halogen? 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 gi... Excess of KI reacts with CuSO4 solution and then Na2S2O3 solution is added to it. Which of the statements is incorrect for this reaction?... Which one of the following substances has the highest proton affinity? For making good quality mirrors, plates of float glass are used. These are obtained by floating molten glass over a liquid metal which does not solidi... Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite What may be expected to happen when phosphine gas is mixed with chlorine gas? Concentrated hydrochloric acid when kept in open air sometimes produces a cloud of white fumes. The explanation for it is that Glass is a Which one of the following statements is correct? Alum helps in purifying water by In XeF2, XeF4, XeF6 the number of lone pairs of Xe are respectively Which of the following statements is true ? Number of sigma bonds in P4O10 is 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... Oxidation number of Cl in CaOCl2 (bleaching powder) is When H2S is passed through Hg2S we get ## Numerical Sum of$$\pi$$-bonds present in peroxodisulphuric acid and pyrosulphuric acid is ___________ The number of non-ionisable protons present in the product B obtained from the following reactions is ___________.$$ \mathrm{C}_{2} \mathrm{H}_{5} \m...
Compound 'P' on nitration with dil. HNO3 yields two isomers (A) and (B). These isomers can be separated by steam distillation. Isomers (A) and (B) sho...
Consider the following reactions: PCl3 + H2O $$\to$$ A + HCl A + H2O $$\to$$ B + HCl The number of ionisable protons present in the product B is _____...
Consider the sulphides HgS, PbS, CuS, Sb2S3, As2S3 and CdS. Number of these sulphides soluble in 50% HNO3 is ___________....
The ratio of number of water molecules in Mohr's salt and potash alum is ____________ $$\times$$ 10$$-$$1. (Integer answer)
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 ...
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' wit...
Among the following allotropic forms of sulphur, the number of allotropic forms, which will show paramagnetism is _________.(A) $$\alpha$$-sulphur(B) ...
The reaction of sulphur in alkaline medium is given below: The values of 'a' is _______. (Integer answer)...

## MCQ (More than One Correct Answer)

Which of the following is the wrong statement?
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