425 questions from a source that prints this span of years rather than the year of each question. Each opens with its answer and explanation.
ABC26IN0693 · In qualitative inorganic analysis of metal ions, the ion which precipitates as sulfide in the presence of H2 S in warm dilute HCl is · D Block – General
ABC26IN0694 · The true statement(s) regarding the brown ring test carried out in the laboratory for the detection of NO3- is/are · D Block – General
ABC26IN0695 · Titanium tetrachloride (TiCl4 ) reacts with THF to form an octahedral complex X under inert atmosphere at 25°C. If 5.0 g of TiCl4 is used… · D Block – General
ABC26IN0696 · Arrange BF3, BCl3 and BBr3 in the increasing order of Lewis acidity and justify. 2(a) Write the steps involved in the production of pure… · Main Group Elements – General
ABC26IN0697 · (being typed) · Main Group Elements – General
ABC26IN0698 · Which of the following reactions does not give H3 PO4 ? · Main Group Elements – General
ABC26IN0699 · 4(a) Consider the ethers H3 SiOSiH3 and H3 COCH3. (i) Which ether has more lewis base character? (ii) Which angle [Si-O-Si and C-O-C] is… · Noble Gas Chemistry
ABC26IN0700 · 5(a) Al2 Cl6 and Al2 Me6 are dimeric in gas phase. Draw their structures. Which compound has more Lewis acid character? Explain. · Main Group Elements – General
ABC26IN0701 · The compound having an S-S single bond is · Main Group Elements – General
ABC26IN0702 · Among the following, the incorrect statement is · Noble Gas Chemistry
ABC26IN0703 · The number of P=O bonds present in the tetrabasic acid H4 P2 O7 is: · Main Group Elements – General
ABC26IN0704 · Calgon used for water softening is Na2 [Na4 (PO3 )6 ] and it is prepared by heating microcosmic salt. The microcosmic salt is: · Main Group Elements – General
ABC26IN0705 · In the structure of B4 O5(OH)42- · Main Group Elements – General
ABC26IN0706 · Hydrolysis of (CH3 )2 SiCl2 and CH3 SiCl3 leads to · Silicates Silicones
ABC26IN0707 · 12(a) In the following reactions, identify X, Y and Z. arrayl Na2 SO3+S boiling water X (colorless complex) \\ AgBr excess X Y (soluble… · Main Group Elements – General
ABC26IN0708 · Number of three-centre two-electron (3e-2e) bonds present in diborane is: · Main Group Elements – General
ABC26IN0709 · Which one of the following order of the carbonates is Correct for their decomposition temperature? · Main Group Elements – General
ABC26IN0710 · The species responsible for the superacidity of SbF5-HSO3 F system is · Main Group Elements – General
ABC26IN0711 · The final products in the reaction of BF3 with water are · Main Group Elements – General
ABC26IN0712 · The number of P-H bonds in hypophosphorus acid is ____. · Main Group Elements – General
ABC26IN0713 · The correct order of the boiling points of the compounds is · Phosphazenes Sn Compounds
ABC26IN0714 · The number of S-S bond(s) in tetrathionate ion is · Main Group Elements – General
ABC26IN0715 · The number of isomeric structures of di-substituted borazine (B3 N3 H4 X2 ) is ____ · Main Group Elements – General
ABC26IN0716 · The CORRECT order of melting points of group 15 trifluorides is · Main Group Elements – General
ABC26IN0717 · On hydrolysis, aluminium carbide produces · Main Group Elements – General
ABC26IN0718 · Among the following compounds, the one having the lowest boiling point is · Phosphazenes Sn Compounds
ABC26IN0719 · Among the following, the correct statement is · Main Group Elements – General
ABC26IN0720 · In the structure of P4 O10, the number of P-O-P bond(s) is ____. · Main Group Elements – General
ABC26IN0721 · Treatment of formic acid with concentrated sulfuric acid gives · Main Group Elements – General
ABC26IN0722 · One of the products of the hydrolysis of calcium phosphide at 25°C is · Main Group Elements – General
ABC26IN0723 · The coordination number of aluminium ion and the number of bridging hydrogen atoms in [Al (BH4 )4 ]- are respectively, · Main Group Elements – General
ABC26IN0724 · The solid state structure of HF is · Main Group Elements – General
ABC26IN0725 · The soft Lewis base(s) is(are) · Main Group Elements – General
ABC26IN0726 · The value of 'n' in [Pn O18 ]6- is ____ · Noble Gas Chemistry
ABC26IN0727 · Reaction of BCl3 with NH4 Cl at 140 C produces compound P. further, P reacts with NaBH4 to give a colorless liquid Q. The reaction of Q… · Noble Gas Chemistry
ABC26IN0728 · The major product formed in the following reaction K+O2 is · Main Group Elements – General
ABC26IN0729 · Among the following, the compound that forms the strongest hydrogen bond is · Main Group Elements – General
ABC26IN0730 · The stability of adducts H3 B PF3, H3 B NMe3, H3 B CO, H3 B OMe2 follows the order · Main Group Elements – General
ABC26IN0731 · The reason(s) for the lower stability of Si2 H6 compared to C2 H6 is/are · Main Group Elements – General
ABC26IN0732 · The radioactive isotope used to locate brain tumors is · Radioactive Decay Kinetics
ABC26IN0733 · The radioactive element Ra(Z=86) emits three alpha particles in succession. Deduce in which group the resulting element will be found? · Radioactive Decay Kinetics
ABC26IN0734 · The half-life of a radioactive nuclide is 20 years. If a sample of this nuclide has an activity of 6400 disintegrations per minute… · Radioactive Decay Kinetics
ABC26IN0735 · 84215 Po undergoes an alpha emission to give element X followed by a beta emission to give element Y . (i) Write the valence shell… · Nuclear Chemistry – General
ABC26IN0736 · In the process 92234 U 90230 Th+X X is: · Nuclear Chemistry – General
ABC26IN0737 · Complete the following nuclear reactions: (i) 714 N+ 24 He 11 H+ ____ (ii) 37 Li+ 11 H ____ · Nuclear Reactions Q Value
ABC26IN0738 · In the following equation X is: 95241 Am+ alpha 97243 Bk+X · Nuclear Chemistry – General
ABC26IN0739 · The total number of steps involved and number of beta particles emitted in the spontaneous decay of 92238 U 82206 Pb respectively, are · Radioactive Decay Kinetics
ABC26IN0740 · In boron neutron capture therapy, the initial boron isotope used and the particle generated after neutron capture respectively are: · Isotope Applications
ABC26IN0741 · The number of alpha and beta particle(s), generated in the following radioactive decay process, are: 92238 U 92234 U · Radioactive Decay Kinetics
ABC26IN0742 · A wood specimen containing 14 C taken from an ancient palace showed 24 counts in 3 minutes per gram of carbon in a detector. however, a… · Nuclear Chemistry – General