Chemistry - 2018 Past Year Paper

NaF, KF, MgO and CaO are crystalline solids. They have NaCl structure. Their lattice energies vary in the order

The major product formed in the following reaction is

The compound that contains the most acidic hydrogen is ​

The C-2 epimer of D-glucose is

The value of integral   is

ghe number of crystal systems and the number of Bravais lattices are, respectively,

For adsorption of a gas on a solid surface, the plot that represents Freundlich isotherm is (x = mass of gas, m = mass of adsorbent, P = pressure)

With respect to periodic properties, the CORRECT statement is

Which plot represents a spectrophotometric titration, where the titrant alone absorbs light in the visible region?

Among the following metal carbonyl species, the one with the highest metal-carbon back bonding is

The CORRECT order of Δ_o (the octahedral crystal field splitting of d orbitals) values for the following anionic metal complexes is

The decay modes of ¹⁴C and ¹⁴O are

Consider the following four xenon compounds: XeF2, XeF4, XeF6 and XeO3 The pair of xenon compounds expected to have non-zero dipole moment is

The CORRECT order of stability for the following carbocations is

Among the dimethylcyclohexanes, which one can be obtained in enantiopure form?

The major product formed in the following reaction is

The product X in the following reaction sequence is

The major product formed in the following reaction is

The major products Y and Z in the following reaction sequence are

The CORRECT order of carbonyl stretching frequencies for the following compounds is

The sequence of three steps involved in the following conversion is​

The CORRECT expression that corresponds to reversible and adiabatic expansion of an ideal gas is 

The electrolyte AB2 ionises in water as

The mean ionic activity coefficient (y± ) is

The reaction, A → Products, follows first-order kinetics. If [A] represents the concentration of reactant at time t, the INCORRECT variation is shown in

The behavior of Cl₂ is closest to ideal gas behavior at

A vector  is rotated through an angle and is also doubled in magnitude resulting inAn acceptable value of x is

With reference to the variation of molar conductivity (L
) with concentration for a strong electrolyte in an aqueous solution, the CORRECT statement is

Which of the following metal(s) is(are) extracted from its(their) sulfide ore(s) by self-reduction/air reduction method?

In a saturated calomel electrode, the saturation is with respect to

Consider the following six solid binary oxides: CaO, Al₂O₃, PbO, Cs₂O, SiO₂ and Sb₂O₃.The pair(s) of ionic oxides is(are)

Choose the CORRECT answer(s) with respect to the magnesium-EDTA titration carried out in the pH range 7 – 10.5, using Solochrome black as indicator

On reaction with NaNO₂ and HCl, which of the following amino alcohol(s) will yield compound P?

The CORRECT statement(s) about carbene is(are)

The compound(s) that shows(show) positive haloform test is(are)

Tetrapeptide(s) that gives(give) the following product on reaction with Sanger’s reagent followed by hydrolysis is(are)

Which of the following set(s) of quantum numbers is(are) NOT allowed?

The CORRECT expression(s) for isothermal expansion of 1 mol of an ideal gas is(are)

The number of possible isomers for [Pt(py)(NH₃)BrCl] is ______. (py is pyridine)The number of possible isomers for [Pt(py)(NH₃)BrCl] is ______. (py is pyridine)

The volume of 0.3 M ferrous ammonium sulphate solution required for the completion of redox titration with 20 mL of 0.1 M potassium dichromate solution is ______mL.

Among the following hydrocarbon(s), how many of them would give rise to three groups of proton NMR peaks with 2:2:3 integration ratio?

The number of stereoisomers possible for the following compound is ______.

The number of hydrogen bond(s) present in a guanine-cytosine base pair is ______.

The time for 50% completion of a zero order reaction is 30 min. Time for 80% completion of this reaction is ______ min.

Consider the reaction 
The value of ΔU for the reaction at 300 K is K is 281.8 kJ mol^-1. The value of DH at same temperature is ______ kJ mol^-1 (rounded up to the first decimal place).
[R = 8.3 J K^-1 mol^-1]

The nuclear spin quantum number (I) of a nucleus is 3/2. When placed in an external magnetic field, the number of possible spin energy states it can occupy is ______.

The value of C_v for 1 mol of N₂ gas predicted from the principle of equipartition of energy, ignoring vibrational contribution, is ______ J K^–1 mol^–1 (rounded up to two decimal places). [R = 8.3 JK^–1mol^–1]

Assuming ideal gas behavior, the density of O2 gas at 300 K and 1.0 atm is ______ g L–1 (rounded up to two decimal places).
[R = 0.082 L atm mol^–1 K^–1, molar mass of O₂ = 32]

How many of the following interhalogen species have 2 lone pairs of electrons on the central atom?

²⁴Na decays to one-fourth of its initial amount in 29.8 hours. Its decay constant is_________ hour^–1 (rounded up to four decimal places).

The magnitude of crystal field stabilization energy (CFSE) of octahedral [Ti(H₂O)₆]³⁺ complex is 7680 cm⁻¹. The wavelength at the maximum absorption (λ_max) of this complex is __________ nm (rounded up to the nearest integer).

Elemental analysis of an organic compound containing C, H and O gives percentage composition: C: 39.9 % and H: 6.7 %. If the molecular weight of the compound is 180, the number of carbon atoms present in the molecule is________.

The number of compounds having S-configuration among the following is _________.

The emf of a standard cadmium cell is 1.02 V at 300 K. The temperature coefficient of the cell is –5.0 x 10^–5 V K–1. The value of ΔH° for the cell is _________ kJ mol^-1 (rounded up to two decimal places).
[1 F = 96500 C mol^-1]

For the reaction the following information is given

For H₂ molecule, the fundamental vibrational frequency  can be taken as 4400 cm^-1. The zeropoint energy of the molecule is ______ kJ mol^-1 (rounded up to two decimal places).
[h = 6.6×10^-34 J s, c = 3×10⁸ m s^-1,N_A = 6×10²³ mol^-1]

The solubility of PbI₂ in 0.10 M KI(aq) is ______ ×10^–7 M (rounded up to two decimal places).
[The solubility product, _sp = 7.1×10^–9]

The electron of a hydrogen atom is in its n^th Bohr orbit having de Broglie wavelength of 13.4 Å.
The value of n is ______ (rounded up to the nearest integer).
[Radius of n^th Bohr orbit = 0.53n² Å, π = 3.14]