ABC26IN1233 · The correct statement regarding closo-\BnHn\ species is: · DEC 2011
ABC26IN1268 · For higher boranes 3c-2e 'BBB' bond may be a part of their structures. In B5 H9, the number of such electron deficient bond(s) present… · DEC 2013
Hydrides
ABC26IN1232 · Among the following, the number of anhydrides of acids are CO, NO, N2 O3, B2 O3, N2 O5, SO3 and P4 O10 · JUNE 2011
ABC26IN0197 · The order of increasing Bronsted acidity for boron hydrides is · 2015
ABC26IN1283 · The order of increasing Bronsted acidity for boron hydrides is · DEC 2015
Main Group Element – General
ABC26IN0433 · Triplet superphosphate is made by treating phosphate rock with · 2005-2021
ABC26IN0434 · The incorrect statement regarding carboranes is that · 2005-2021
ABC26IN0435 · Mg6 Si4 O10(OH)8 is commercially known as · 2005-2021
ABC26IN0436 · The series with the orrect order of decreasing ionic size is · 2005-2021
ABC26IN0437 · When Al4 C3 and Mg2 C3 reacts with H2 O, then major products formed respectively, are · 2005-2021
ABC26IN0438 · Boric acid in aqueous solution in presence of glycerol behaves as a strong acid due to the formation of · 2005-2021
ABC26IN0439 · The compounds X and Y in the following reactio are P4 S10 EtOH(X) Cl2(Y) p-O2 NC6 H4 ONa Parathion · 2005-2021
ABC26IN0440 · The Lewis acid character of BF3, BCl3 and BBr3 follows the order · 2005-2021
ABC26IN0441 · The reaction of Al4 C3 with water leads to the formation of · 2005-2021
ABC26IN0442 · The correct statement about C60 is · 2005-2021
ABC26IN0443 · The INCORECT statement about linear dimethylopolysiloxane, [ (CH3 )2 SiO ]n, is · 2005-2021
ABC26IN0444 · The reaction of phosgene with an excess of NH3 produces · 2005-2021
ABC26IN0445 · The coordination number of the Ba2+ ions in barium fluoride is 8 . The coordination number of the fluorie ion is: · 2005-2021
ABC26IN0446 · In the reaction HSO4-(aq)+OH-(aq) SO42-(aq)+H2 O(), the conjugate acid-base pairs are · 2005-2021
ABC26IN0447 · The reaction X and Y, respectively, are · 2005-2021
ABC26IN0448 · The structure of triphosphazene is · 2005-2021
ABC26IN0449 · The Lewis acidity of BF3 is less than CBl3 even though fluorine is more electronegative than chlorine. It is due to · 2005-2021
ABC26IN0450 · Pyrozenes are a class of silicate minerals, which exhibit a polymeric chain structure, as shown below Its simplest repeat unit is · 2005-2021
ABC26IN0451 · Among the following pentachlorides the one which does not exist due to the 'inertpair effeect' is · 2005-2021
ABC26IN0452 · In the following reactions: the reagent / conditions X and Y are · 2005-2021
ABC26IN0453 · Among the following, the group of molecules that undergoes rapid hydrolysis is: · 2005-2021
ABC26IN0454 · The reaction of solid XeF2 with AsF5 in 1:1 ratio affords · 2005-2021
ABC26IN0455 · For Et2 AlX (X=PPh2-, Ph-, Cl-1 . and .H- ), the tendency towards dimeric structure follows the order · 2005-2021
ABC26IN0456 · The ideal molar ratio of Na2 HPO4 to NaH2 PO4 is: · 2005-2021
ABC26IN0457 · The total charge on pentaphosphate anion is: · 2005-2021
ABC26IN0458 · The enthalpies of hydration of Ca2+, Mn2+ and Zn2+ follow the order · 2005-2021
ABC26IN0459 · Among the following substituted silanes, the one that gives cross-linked silicone polymer upon hydrolysis is · 2005-2021
ABC26IN0460 · Among the following donors, the one that forms most stable adduct with the Lewis acid B (CH3 )3 is: · 2005-2021
ABC26IN0461 · The order of polarity of NH3, NF3 and BF3 is: · 2005-2021
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… · 2005-2021
ABC26IN0463 · The increasing order of melting points of the halides NaCl, CuCl and NaF is: · 2005-2021
ABC26IN0464 · The number of S-S bonds in H2 S5 O6 is ____ · 2005-2021
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 · 2005-2021
ABC26IN0466 · The ease of formation of the adduct, NH3 . BX3 (where X=F, Cl, Br ) follows the order · 2005-2021
ABC26IN0467 · Ammonolysis of S2 Cl2 in an inert solvent gives · 2005-2021
ABC26IN0468 · The reaction of P2 O5 with HNO3 and HClO4, respectively, gives · 2005-2021
ABC26IN0469 · Sodium salt of pseudohalogens, X, Y and Z form colorless solutions in water. Solution of X decolorizes I3- solution with brisk… · 2005-2021
ABC26IN0470 · In cyclophosphazenes (NPX2 )3(X=F, Cl, Br and Me), the strength of P-N pi - bond varies with X in the order · 2005-2021
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… · 2005-2021
ABC26IN0472 · Among the following carbon allotropes, the one with discrete molecular structure is · 2005-2021self-practice
ABC26IN0473 · The INCORRECT statement about the silicones is · 2005-2021self-practice
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 ]… · 2005-2021self-practice
ABC26IN0475 · The CORRECT statement about hexagonal boron nitride is: · 2005-2021
ABC26IN0476 · The rate of solvolysis of the given compounds is in the order: P Q R S T · 2005-2021
ABC26IN0477 · The major product formed in the reaction of (2 R, 3 R)-2- bromo -3- methylpentane with NaOMe is: · 2005-2021self-practice