RE-NEET Chemistry Questions

In Geiger-Marsden experiment, the number of scattered α-particles N(θ) is plotted as a function of scattering angle θ. Which of the following options represents the correct plot?

Consider that an electron is revolving in an excited state of Hydrogen atom with velocity √25.6 ×10⁵ ms⁻¹. The radius of the orbit is x×10⁻⁹ m. The value of x is: [Take the mass of electron to be 9×10⁻³¹ kg, charge of electron = −1.6×10⁻¹⁹ C and 1/4πε₀ = 9×10⁹ N m² C⁻²]

Match the species in List I with their geometry in List II.

The amino acid that gives a red-blood colour on treating its sodium fusion extract with sodium nitroprusside is

Given below are two statements:

Statement-I: Oxidation of p-nitrotoluene with acidic KMnO₄ gives an acid that is stronger than benzoic acid.

Statement-II: Reduction of p-nitrotoluene with Sn/HCl followed by neutralization gives an amine that is more basic than aniline.

In light of the above statements, choose the most appropriate answer from the options given below.

The standard electrode potential (E°) for the half-cell reaction Fe³⁺ + e⁻ → Fe²⁺ at 298 K is

(Given: E°(Fe³⁺/Fe) = -0.04 V and E°(Fe²⁺/Fe) = -0.44 V at 298 K)

The compound that CANNOT be obtained from the aldol condensation reaction shown below, is

For a salt XY, which is a strong electrolyte, the plot of Λₘ versus √C has a slope of −90.0 S cm² mol⁻³/² L¹/² at 298 K. At 0.01 M concentration of XY, the value of Λₘ is 145.0 S cm² mol⁻¹. The limiting molar conductivity of Y⁻ ion (Λ⁰ᵧ⁻, in S cm² mol⁻¹) at 298 K will be

(Given: Λ⁰ₓ⁺ = 74.0 S cm² mol⁻¹)

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: The first ionization enthalpy of O is lower than that of N and F. Reason R: The loss of an electron from O leads to stable half-filled p orbital. In light of the above statements, choose the most appropriate answer from the options given below:

According to crystal field theory, the correct order of ligands with respect to their decreasing order of field strength is

Given below are two statements: Statement-I: [Fe(ox)₃]³⁻ is chiral. Statement-II: trans-[Cr(H₂O)₂(ox)₂]⁻ is chiral. (Given: oxH₂ = HOOC - COOH) In light of the above statements, choose the most appropriate answer from the options given below:

For the following reaction sequence, choose the correct option

For an elementary chemical reaction, the Arrhenius plot is given below. If the energy of activation is 6.64 kJ mol⁻¹ and R = 8.3 J K⁻¹ mol⁻¹, the temperature at which the rate constant becomes e² min⁻¹ is

Arrange the following compounds in the increasing order of polarity

A. CH₃CH₂OCH₂CH₃

B. CH₃CH₂OH

C. CH₃COCH₃

D. CH₃COOH Choose the correct answer from the options given below.

A protein undergoes reversible thermal denaturation from its initial state N to denatured state D according to N ⇌ D. At 60 °C, the concentrations of both N and D are equal at equilibrium, and the standard enthalpy change of denaturation is 666 kJ mol⁻¹. The standard entropy change (ΔS° in kJ K⁻¹mol⁻¹) of the protein upon denaturation at 60 °C is closest to

Consider the following statements about the solutions formed by mixing two liquids.

A. An ideal solution thus formed obeys Raoult’s law throughout the composition range.

B. Mixture of chloroform and acetone shows negative deviation from Raoult’s law.

C. Mixture of aniline and phenol shows positive deviation from Raoult’s law.

Given below are two statements:

Statement-I: Heating NaCl with concentrated H₂SO₄ and MnO₂ results in oxidation of Mn.

Statement-II: Heating NaI with concentrated H₂SO₄ and MnO₂ results in reduction of Mn. In light of the above statements,

choose the most appropriate answer from the options given below:

Given below are two statements:

Statement I: trans-But-2-ene upon treatment with Br₂ in CCl₄ gives the following product.

Statement II: cis-But-2-ene upon treatment with alkaline KMnO₄ gives the following product.

The highest occupied molecular orbital for Ne₂ is

The following carbocation is stabilized by the interaction of the empty p orbital with

The green paramagnetic species formed by heating KMnO₄ at 513 K is

The correct statement is

The correct statement about peptides and proteins is

2A → B is a zero-order reaction, where k = 1.0 mol L⁻¹ min⁻¹. If the initial concentration of A is 2 M, then the time taken to complete 75% of the reaction will be

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Generally, 3d transition metals have high melting points. Reason R: Involvement of 3d-electrons in addition to 4s-electrons in the interatomic metallic bonding.

In light of the above statements, choose the most appropriate answer from the options given below:

Consider the following schematic plots of orbital wavefunction (ψr) against distance (r) from the nucleus. The figure representing two radial nodes in the orbital is

Identify the reactions which give aniline as the major product.

Among the species given below, the spin-only magnetic moment is highest for (Given: Atomic number of Ti = 22, Mn = 25, Fe = 26 and Co = 27)

The complex which has facial and meridional isomers is (Given: py = pyridine and en = H₂N-CH₂-CH₂-NH₂)

A 1:3 electrolyte in an aqueous solution is

Consider the reversible processes for 1.0 mol of an ideal gas as shown in the figure. w₁, w₂, w₃ and w₄ represent work done (in calories) in the processes 1, 2, 3 and 4, respectively; ΔU₂ and ΔU₄ are changes in the internal energy for the processes 2 and 4, respectively. [use R = 2 cal K⁻¹ mol⁻¹] The correct option is

In an acidic medium, 10 mL of 0.25 M oxalic acid is titrated with KMnO₄ solution. If the volume of KMnO₄ solution required to reach end point is 10 mL, the strength of the KMnO₄ solution is

The lanthanide ion having four unpaired electrons is (Given: Atomic numbers of Ce=58, Nd=60, Tb=65 and Ho=67)

The correct decreasing order of oxidation state of the underlined atom in each molecule is

The formula of tetraammineaquachloridocobalt(III) chloride is

Consider the following reaction, and choose the correct option.

Assertion A: For an ideal solution formed by mixing liquids P and Q, Δ_mix H = 0 and Δ_mix V = 0. Reason R: No interactions occur between P and Q. In the light of the above statements, choose the most appropriate answer from the options given below.

Match the vitamins in List I with their sources in List II.

Among the following, the compound having conjugated double bonds is

One of the products formed in the following reaction is

Two moles of an ideal gas undergo free expansion from 10 L to 100 L at 300 K. The values of ΔS_system and ΔS_surroundings are (R is universal gas constant)

Among the following options, the correct trend in the electron gain enthalpy is

The correct order of solubility of the given salts in water at 298 K is

Consider the following reaction sequences and choose the correct option.

The amount of carbon dioxide evolved upon complete combustion of 116 g of n-butane is (Given: atomic mass in amu H=1, C=12 and O=16)

The numbers 17.0145 and 21.0235 were rounded to three figures after the decimal point. The resulting numbers, respectively, are

In potash alum, the ratio of K⁺ and SO₄²⁻ ions is

The spectral series which corresponds to the electronic transition from the levels n₂ = 5, 6,... to the level n₁ = 4 is

Some energy levels of a molecule are shown in the figure with their wavelengths of transitions. Then:

The correct decreasing order of atomic radii (pm) of Li, Be, B and C is