Chemistry - 2019 Past Year Paper

For three non-coplanar vectors a, b and c, the expression a ∙ (b × c) can be written as

Correct trend in the bond order is

The correct option for the metal ion present in the active site of myoglobin, hemocyaninand vitamin B12, respectively, is

The correct order of wavelength (λ_max) of the halide to metal charge-transfer band of [Co(NH₃)₅Cl]²⁺ (I), [Co(NH₃)5Br]²⁺ (II) and [Co(NH₃)₅I]²⁺ (III), is

The correct option for the major products of the following reaction is

The major product formed in the following reaction is

The complementary strand for the following single strand of DNA is

The function f(x) x e-x² has a minimum at

The correct option for the number of bending modes of vibration in each of H₂O, CS₂ and SO₂ molecules, respectively, is

The total number of degrees of freedom of an HBr molecule that is constrained to translate along a straight line but does not have any constraints for its rotation and vibration is

According to the kinetic theory of gases, the ratio of the root mean square velocity of molecular oxygen and molecular hydrogen at 300 K is

The half-life of the chemical reaction, A → Product, for initial reactant concentrations of 0.1 and 0.4 mol L^–1 are 200 and 50 s, respectively. The order of the reaction is

The ratio of the nearest neighbor atomic distances in body-centered cubic (bcc) and facecentered cubic (fcc) crystals with the same unit cell edge length is

The correct trend in the rate of substitution of Cl- by pyridine in the following complexes is

In qualitative inorganic analysis of metal ions, the ion which precipitates as sulfide in the presence of H₂S in warm dilute HCl is

The correct statement regarding the observed magnetic properties of NO, O₂, B₂, and C₂ in their ground state is

The observed magnetic moments of octahedral Mn³⁺, Fe³⁺ and Co³⁺ complexes are 4.95, 6.06 and 0.00 BM, respectively. The correct option for the electronic configuration of Mn³⁺, Fe³⁺ and Co³⁺ metal ions in these complexes, respectively, is

Among the following compounds, the one having the lowest boiling point is

The correct option having one complex from each of the following pairs which is more reactive towards the oxidative addition reaction by hydrogen molecule is
Pair 1: IrCl(PMe₃)₃ (I) and IrCl(CO)(PMe₃)₂ (II)
Pair 2: IrCl(CO)(PPh₃)₂ (III) and IrCl₃(PPh₃) (IV)

Among the following, the correct statement is

The major product of the following reaction is

In ¹H NMR spectrum of the given molecule, the correct order of chemical shifts of the labelled protons (H^X, H^Y, H^Z) is

In the following reaction of (D)-Glucose, a product P is formed.
Among the following compounds, the one which will give the same product (P) under identical reaction conditions is

The major product of the following reaction is

The correct option for the product(s) of the following reaction is

The increasing order of acidity of the given molecules in aqueous media is

The compound formed upon subjecting an aliphatic amine to Lassaigne’s test is

The eigenvalue(s) of the matrix   is/are

The unit of the constant ‘a’ in van der Waals equation of state of a real gas can be expressed as 

Among the following, microwave active molecule(s) is/are​

The true statement(s) regarding the brown ring test carried out in the laboratory for the detection of NO₃- is/are

The true statement(s) regarding the carbonic anhydrase enzyme is/are

The correct statement(s) about NO₂, NO₂+ and CO₂ is /are

The compound(s) formed as intermediate(s) in the following reaction sequence is/are

The correct statement(s) among the following is/are

The diastereomeric pair(s) among the following option(s) is/are

The reaction(s) that result(s) in the formation of aromatic species is/are

The bond order of ion is __________. (Round off to one decimal place) 

One liter of a buffer solution contains 0.004 mole of acetic acid (pK_a = 4.76) and 0.4 mole of sodium acetate. The pH of the solution is __________. (Round off to two decimal places)

The limiting molar conductivity of La³⁺ and Cl^– ions in aqueous medium at 298 K are 209.10 x10^–4 and 76.35 x 10^–4 S m² mol^–1, respectively. The transport number of Cl^– in an infinitely dilute aqueous solution of LaCl₃ at 298 K is __________. (Round off to two decimal places)

The magnetic field strength required to excite an isolated proton to its higher spin state with an electromagnetic radiation of 300 MHz is __________ Tesla (T). (Round off to two decimal places)
[Magnetogyric ratio of proton is 26.75 x 10⁷ rad T^–1 s^–1]

The value of n for the complex [Fe(CO)₄(SiMe₃)]n satisfying the 18-electron rule is __________.

In the structure of P₄O₁₀, the number of P-O-P bond(s) is __________.

Number of vertices in an icosahedral closo-borane is __________.

Based on the information given below, the isoelectric point (pI) of lysine is __________. (Round off to one decimal place)

(R)-2-methyl-1-butanol has a specific rotation of +13.5°. The specific rotation of 2-methyl1-butanol containing 40% of the (S)-enantiomer is __________ °. (Round off to one decimal place)

The number of gauche-butane interaction(s) in the following compound is__________. 

The ionization energy of hydrogen atom is 13.6 eV and the first ionization energy of sodium atom is 5.1 eV. The effective nuclear charge experienced by the valance electron of sodium atom is __________. (Round off to one decimal place)

One mole of an ideal gas is subjected to an isothermal increase in pressure from 100 kPa to 1000 kPa at 300 K. The change in Gibbs free energy of the system is __________ kJ mol^–1.
(Round off to one decimal place)
[Given: Gas constant (R) = 8.3 J K^–1 mol^–1]

One liter of an aqueous urea solution contains 6 g of urea. The osmotic pressure of the solution at 300 K (assuming an ideal behavior) is __________ kPa. (Round off to one decimal place)
[Given: Molecular weight of urea is 60, gas constant (R) is 8.3 J K^–1 mol^–1]

A first order reflection of X-ray from {220} plane of copper crystal is observed at a glancing angle of 22°. The wavelength of the X-ray used is __________ pm. (Round off to one decimal place)
[Given: Copper forms fcc crystal with unit cell edge length of 361 pm.]

The collision flux of a monoatomic gas on copper surface is 3.0 x 10¹⁸ m^–2  s^–1. Note that copper surface forms a square lattice with lattice constant of 210 pm. If the sticking coefficient of the atom with copper is 1.0, the time taken by the gas to form a complete monolayer on the surface is __________ s. (Round off to one decimal place) 

The turnover frequency (TOF) for the catalytic reaction,

with 90% yield of the product is __________ hour^-1. (Round off to the nearest integer)

A radioactive sample decays to 10% of its initial amount in 4600 minutes. The rate constant of this process is __________ hour^-1. (Round off to two decimal places)

Given that the radius of the first Bohr orbit of hydrogen atom is 53 pm, the radius of its third Bohr orbit is __________ pm. (Round off to the nearest integer)

5.3 g of benzaldehyde was reacted with an excess of acetophenone to produce 5.2 g of the enone product as per the reaction shown below. The yield of the reaction is __________ %. (Round off to the nearest integer)

Assume that the reaction of MeMgBr with ethylacetate proceeds with 100% conversion to give tert-butanol. The volume of 0.2 M solution of MeMgBr required to convert 10 mL of a 0.025 M solution of ethylacetate to tert-butanol is __________ mL. (Round off to one decimal place)