629 questions from a source that prints this span of years rather than the year of each question. Each opens with its answer and explanation.
ABC26IN0438 · Boric acid in aqueous solution in presence of glycerol behaves as a strong acid due to the formation of · Main Group Element – General
ABC26IN0439 · The compounds X and Y in the following reactio are P4 S10 EtOH(X) Cl2(Y) p-O2 NC6 H4 ONa Parathion · Main Group Element – General
ABC26IN0440 · The Lewis acid character of BF3, BCl3 and BBr3 follows the order · Main Group Element – General
ABC26IN0441 · The reaction of Al4 C3 with water leads to the formation of · Main Group Element – General
ABC26IN0442 · The correct statement about C60 is · Main Group Element – General
ABC26IN0443 · The INCORECT statement about linear dimethylopolysiloxane, [ (CH3 )2 SiO ]n, is · Main Group Element – General
ABC26IN0444 · The reaction of phosgene with an excess of NH3 produces · Main Group Element – General
ABC26IN0445 · The coordination number of the Ba2+ ions in barium fluoride is 8 . The coordination number of the fluorie ion is: · Main Group Element – General
ABC26IN0446 · In the reaction HSO4-(aq)+OH-(aq) SO42-(aq)+H2 O(), the conjugate acid-base pairs are · Main Group Element – General
ABC26IN0447 · The reaction X and Y, respectively, are · Main Group Element – General
ABC26IN0448 · The structure of triphosphazene is · Main Group Element – General
ABC26IN0449 · The Lewis acidity of BF3 is less than CBl3 even though fluorine is more electronegative than chlorine. It is due to · Main Group Element – General
ABC26IN0450 · Pyrozenes are a class of silicate minerals, which exhibit a polymeric chain structure, as shown below Its simplest repeat unit is · Main Group Element – General
ABC26IN0451 · Among the following pentachlorides the one which does not exist due to the 'inertpair effeect' is · Main Group Element – General
ABC26IN0452 · In the following reactions: the reagent / conditions X and Y are · Main Group Element – General
ABC26IN0453 · Among the following, the group of molecules that undergoes rapid hydrolysis is: · Main Group Element – General
ABC26IN0454 · The reaction of solid XeF2 with AsF5 in 1:1 ratio affords · Main Group Element – General
ABC26IN0455 · For Et2 AlX (X=PPh2-, Ph-, Cl-1 . and .H- ), the tendency towards dimeric structure follows the order · Main Group Element – General
ABC26IN0456 · The ideal molar ratio of Na2 HPO4 to NaH2 PO4 is: · Main Group Element – General
ABC26IN0457 · The total charge on pentaphosphate anion is: · Main Group Element – General
ABC26IN0458 · The enthalpies of hydration of Ca2+, Mn2+ and Zn2+ follow the order · Main Group Element – General
ABC26IN0459 · Among the following substituted silanes, the one that gives cross-linked silicone polymer upon hydrolysis is · Main Group Element – General
ABC26IN0460 · Among the following donors, the one that forms most stable adduct with the Lewis acid B (CH3 )3 is: · Main Group Element – General
ABC26IN0461 · The order of polarity of NH3, NF3 and BF3 is: · Main Group Element – General
ABC26IN0462 · If a mixture of NaCl , conc. H2 SO4 and K2 Cr2 O7 is heated in a dry test tube, a red vapour (P) is formed. This vapour (P) dissolves in… · Main Group Element – General
ABC26IN0463 · The increasing order of melting points of the halides NaCl, CuCl and NaF is: · Main Group Element – General
ABC26IN0464 · The number of S-S bonds in H2 S5 O6 is ____ · Main Group Element – General
ABC26IN0465 · BCl3 and NH4 Cl were heated at 140 C to give compound X , which when treated with NaBH4 gave another compound Y . Compounds X and Y are · Main Group Element – General
ABC26IN0466 · The ease of formation of the adduct, NH3 . BX3 (where X=F, Cl, Br ) follows the order · Main Group Element – General
ABC26IN0467 · Ammonolysis of S2 Cl2 in an inert solvent gives · Main Group Element – General
ABC26IN0468 · The reaction of P2 O5 with HNO3 and HClO4, respectively, gives · Main Group Element – General
ABC26IN0469 · Sodium salt of pseudohalogens, X, Y and Z form colorless solutions in water. Solution of X decolorizes I3- solution with brisk… · Main Group Element – General
ABC26IN0470 · In cyclophosphazenes (NPX2 )3(X=F, Cl, Br and Me), the strength of P-N pi - bond varies with X in the order · Main Group Element – General
ABC26IN0471 · The reaction of PCl3 with PhLi in 1: 3 molar ratio yields X as one of the products, which on further treatment with CH3 I gives Y. The… · Main Group Element – General
ABC26IN0472 · Among the following carbon allotropes, the one with discrete molecular structure is · Main Group Element – General
ABC26IN0473 · The INCORRECT statement about the silicones is · Main Group Element – General
ABC26IN0474 · Following are the examples of silicate minerals (I) Zircon, ZrSiO4 (II) Beryl, Be3 Al2 Si6 O18 (III) Pyrophyllite, Al2(OH)2 [ (Si2 O5 )2 ]… · Main Group Element – General
ABC26IN0475 · The CORRECT statement about hexagonal boron nitride is: · Main Group Element – General
ABC26IN0476 · The rate of solvolysis of the given compounds is in the order: P Q R S T · Main Group Element – General
ABC26IN0477 · The major product formed in the reaction of (2 R, 3 R)-2- bromo -3- methylpentane with NaOMe is: · Main Group Element – General
ABC26IN0478 · The correct order of Lewis acid strengths of BF2 Cl, BFClFBr, BF2 Br and BFBr2 is: · Main Group Element – General
ABC26IN0479 · Reaction of LiAlH4 with one equivalent of Me3 N HCl gives a tetrahedral compound, which reacts with another equivalent of Me3 N HCl to give… · Main Group Element – General
ABC26IN0480 · Among the following, the most stable isotope to radioactive decay is · Nuclear – General
ABC26IN0481 · 210Bi undergoes beta - decay to 1/8 of its initial amount in 15 days. The time required for its decay to 1/4 of its initial amount is ____… · Nuclear – General
ABC26IN0482 · The total number of alpha and beta particles emitted in the following radioactive decay is ____ 92238 U 82210 Pb · Nuclear – General
ABC26IN0483 · The fission reaction of 92235 U with thermal neutron is represented below. 4199 Nb and 51133 Sb are the primary fission fragment pair… · Nuclear – General
ABC26IN0484 · Given the initial weight of 1 mg of radioactive 2760 Co (half-life =5.27 years), the amount disintegrated in 1 year (rounded off to two… · Nuclear – General
ABC26IN0485 · The neutral complex which follows the 18 -electron rule is · 18 Electron Rule
ABC26IN0486 · For the metal - olefin complexes (i) [PtCl3 (C2 H4 ) ]-and (ii) [PtCl3 (C2 F4 ) ]-, the correct statement is that · Metal Carbonyls
ABC26IN0487 · The value of M-C stretching frequencies of (i) [V(CO)6 ]-, (ii) [Cr(CO)6 ] and (iii) [Mn(CO)6 ]+following the trend · Organometallic Compounds – General