The first row transition metal complexes having tetrahedral geometry are high- spin due to
The species responsible for the superacidity of SbF5- HSO3F system is
A filter paper moistened with cadmium acetate solution turns yellow upon exposure to H2S. The transition responsible for the yellow colour is
Low- spin iron(III) center is present in
The major product formed in the following reaction is
The structure of (2S,3R)- 2- amino- 3- hydroxy butanoic acid is
The ene- yne that produces a chiral compound upon treatment with Lindlar’s catalyst is
An organic compound P (C4H8O) is positive to Bayer¡¦s test, but inert to sodium metal. On treatment with conc. HCl, P gives CH3CH2Cl and CH3CHO. The structure of P is
Which one of the following is an identity matrix?
The intermolecular van der Waals potential is inversely proportional to r6. The corresponding force is proportional to
The normal spinel among the following mixed metal- oxides is
The ground state term for a free ion with 3d7 configuration is
The reagent ‘oxine’ commonly used in analytical chemistry is
The species having trigonal pyramidal shape is
The correct statement about ionization potential (IP) is
Mass of one molecule of sulphuric acid is
The set of products formed in the following reaction is
The correct set of reagents required for the following transformation is
The correct order of the pKa values for the conjugate acids of heterocyclic compounds given below is
The correct order of the 1H NMR chemical shift values for the indicated hydrogens (in bold) in the following compounds is
Which of the following statements are correct for SNAr reaction?
(i) Follows second order kinetics
(ii) KH/KD > 1
(iii) Involves carbanion- type intermediate
(iv) Involves two transition states
According to the equipartition principle, the predicted high temperature limiting value of the molar heat capacity at constant volume for C2H2 is
The major product formed in the following reaction is
At 25 °C, the solubility product (Ksp) of CaF2 in water is 3.2 × 10–11. The solubility (in mole per kg of water) of the salt at the same temperature (ignore ion pairing) is
For an isothermal free expansion of an ideal gas into vacuum, which one of the following set of values is correct?
The kinetics of the reaction 2N2O5 → 4NO2 + O2 in liquid bromine medium was measured independently for three different initial concentrations of N2O5: 0.11, 0.07 and 0.05 mol L–1. The half- life of the reaction was found to be 4.5 hours for all these concentrations. The order of the reaction is
The concentration of K+ ion inside a biological cell is 20 times higher than outside.The magnitude of potential difference between the two sides is [Given: 2.303 RT/F = 59 mV]
The correct order of the fundamental vibrational frequencies of the following diatomic molecules is
Identify the correct reagents required for the following transformation
The complex that is expected to show orbital contribution to the overall magnetic moment is
The common feature(s) of Rb+, Kr and Br– is/are that they
The characteristics of the blue solution of sodium in liquid ammonia is/are
Which of the following statement(s) is/are true about the transition metal- alkene complexes?
Which of the following statement(s) is/are true about the reaction given below?
The reaction(s) which give(s) phenol is/are
Which of the following species is/are aromatic in nature?
Which of the following compound(s) show(s) only two signals in 1H NMR and a strong IR band at ~1690 cm–1?
If and then the value(s) of is/are
At what angle(s) of incidence, X- rays of wavelength 5.0 Å will produce diffracted beam from the (110) planes in a simple cubic lattice with a = 10 Å?
Which of the following thermodynamic relation(s) is/are correct?
Given that the crystal field stabilization energy for [Co(H2O)6]2+ is 7360 cm–1, the calculated value of Δo in kJ mol-1 is _______
The amount (in grams) of potassium dichromate (MW = 294) present in 75 mL of 0.16 M aqueous solution is _______
Given that the expected spin- only magnetic moment for (Et4N)2[NiCl4] is 2.83 μB, the total number of unpaired electrons in this complex is _______
The pKa values of lysine are 2.18, 8.95 and 10.79. The isoelectric point of lysine is _______
The amount (in grams) of NaOH (MW = 40) required for complete neutralization of one mole of the following compound is _______
In the given list, the total number of compounds that form a clear homogenous solution on treatment with cold dilute H2SO4 is _______
In the gas phase, the ratio of excluded volume to molecular volume for a spherical molecule is _______
The pKa values of H3PO4 are 2.12, 7.21 and 12.67. The pH of a phosphate buffer containing 0.2 M NaH2PO4 and 0.1 M Na2HPO4 is _______
For the reaction, the equilibrium constant KP = 5.0 at 207 °C. If the partial pressures of SO2, O2 and SO3 are 1.0 × 10–3, 0.20 and 1.0 × 10–4, respectively, then the Gibbs free energy of the reaction (ΔrG) in kJ mol-1 at 207°C is _________
[Given: R = 8.314 J K-1mol–1]
Two moles of an ideal gas is expanded isothermally and reversibly from 5 to 1 bar at 298 K. The change in the entropy (in J K–1) of the system is _______
The ionic radii of Cs+ and Cl- ions are 181 and 167 pm, respectively. The Born exponents for the He, Ne, Ar, Kr and Xe configurations are 5, 7, 9, 10 and 12, respectively. If the value of is 2.45 × 10–4 J m, the lattice energy (in kJ mol–1) of CsCl according to Born- Landé equation is ________
A 2.5 × 10–4 M solution of a complex exhibits an absorption maximum at 625 nm with an absorbance of 0.90 when measured in a cuvette with a path length of 1.5 cm. The absorbance of 1.5 × 10–3 M solution of the same complex recorded in a cuvette with a path length of 0.2 cm is _______
A wood specimen containing 14C taken from an ancient palace showed 24 counts in 3 minutes per gram of carbon in a detector. However, a fresh wood showed 52 counts in 2 minutes per gram of carbon. Assuming no background signal in the detector and half life of 14C as 5730 years, the age (in years) of the wood specimen is _______
The magnetic field (in Tesla) required for flipping a 1H nucleus in an NMR spectrometer operating at 400 MHz is _______ [Given: g = 2.67 × 108 T–1 s–1, π = 3.14]
The total number of compounds (shown below) that form phenylhydrazone derivatives under acidic conditions is _______
The number of possible monoalkylated products formed in the Friedel- Crafts reaction of anisole with 2- chloro- 3- methylbutane in the presence of anhydrous AlCl3 at 50 °C is _______
For a reaction, the rate constant at 25 °C is doubled when the temperature is raised to 45 °C. The activation energy (in kJ mol–1) of the reaction is _______ [Given: ln2 = 0.693]
The standard reduction potentials of the Fe3+/Fe2+ and Fe2+/Fe couples are 0.77 and –0.44 V, respectively. The standard reduction potential (in V) for the Fe3+/Fe couple is _______
When a perfect monolayer of stearic acid is formed at the air- water interface, each molecule of stearic acid (MW = 284, density = 0.94 g cm–3) occupies an area of 20 Å2. The length (in Å) of the molecule is _______
In an ideal monoatomic gas, the speed of sound is given by If the speed of sound in argon at 25 °C is 1245 km h–1, the root mean square velocity in m s–1 is _______