489 questions from a source that prints this span of years rather than the year of each question. Each opens with its answer and explanation.
ABC26IN0461 · The order of polarity of NH3, NF3 and BF3 is: · Main Group Element – General
ABC26IN0462 · If a mixture of NaCl, conc. H2SO4 and K2Cr2O7 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
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… · 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 23592U with thermal neutron is represented below. 9941Nb and 13351Sb are the primary fission fragment pair, which… · 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
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
ABC26IN0490 · [Co(CO)4] is isolobal with · Organometallic Compounds – General
ABC26IN0491 · The CORRECT order of the CO stretching vibrational frequency is · Organometallic Compounds – General
ABC26IN0492 · W(CO)6 reacts with MeLi to give an intermediate which upon treatment with CH2 N2 gives compound X. X is represented as · 18 Electron Rule
ABC26IN0493 · Considering the quadrupolar nature of M-M bond in [Re2Cl8]2-, the M-M bond order in [Re2Cl4 (PMe2Ph)4]+ and [Re2Cl4 (PMe2Ph)4] respectively… · Organometallic Compounds – General
ABC26IN0494 · In the complex, [Ni2 (eta 5-Cp)2(CO)2], the IR stretching frequency appears at 1857 cm-1 (strong) and 1897 cm-1 (weak). The valence… · Organometallic Compounds – General
ABC26IN0495 · The correct classification of [B5H5]2-, B5H9 and B5H11 respectively is · Organometallic Compounds – General
ABC26IN0497 · The catalyst used in the conversion of ethylene to acetaldehyde using Wacker process is · Cluster Compounds Wade Rules
ABC26IN0498 · Zeise's salt is represented as · Organometallic Compounds – General
ABC26IN0499 · Metal-metal quadruple bonds are well-known for the metal · Metal Carbonyls
ABC26IN0500 · The Bronsted acidity of boron hydrides follows the order · Organometallic Compounds – General
ABC26IN0501 · White phosphorus, P4, belongs to the · Organometallic Compounds – General
ABC26IN0502 · The number of M-M bonds in Ir4(CO)12 are · Organometallic Compounds – General
ABC26IN0503 · Schrock carbenes are · Carbene Carbyne
ABC26IN0505 · The correct order of vco for the compounds [Mo(CO)3 (NMe3)3], [Mo(CO)3 (P(OPh)3)3], [Mo(CO)3(PMe)3], [Mo(CO)3 (PCl3)3] in the IR spectrum… · Cluster Compounds Wade Rules
ABC26IN0506 · In the reaction, Ph3 P MeI[X] n-BuLi[Y], the compounds X and Y, respectively are · Cluster Compounds Wade Rules
ABC26IN0509 · The number of ‘framework electron pairs’ present in the borane cluster [B12H12]2- is: · Organometallic Compounds – General
ABC26IN0510 · The reaction between {PdCl4]2- and C2H4 produces a new compound. Compare to free C2H4, the C-C bond order of the product is: · Organometallic Compounds – General
ABC26IN0511 · Structurally nickellocene is similar to ferrocene. Nickellocene attains stability due to the formation of · Cluster Compounds Wade Rules
ABC26IN0512 · The total number of metal-metal bonds in Ru3(CO)12 and Co4(CO)12, respectively, is · Metal Carbonyls
ABC26IN0513 · The product of the reaction between CH3 Mn(CO)5 and 13 CO is: · Organometallic Compounds – General
ABC26IN0514 · The number of terminal carbonyl groups present in Fe2(CO)9 is · Organometallic Compounds – General
ABC26IN0515 · An intermediate formed during the hydroformylation of olefins using Co2(CO)8 as catalyst is · Organometallic Compounds – General
ABC26IN0516 · Decarbonylation reaction of [cis- (CH3 CO) Mn (13 CO)(CO)4] yields X, Y and Z, where X= [(CH3) Mn(CO)5]; Y= [cis-(CH3) Mn (13 CO) CO4]; Z=… · Organometallic Compounds – General
ABC26IN0517 · According to polyhedral electron count rule, the structure of Rh6(CO)16 is: · 18 Electron Rule