NEET Chemistry Class 11 Questions

Taking the Bohr radius as a₀ = 53 pm, the radius of Li⁺⁺ ion in its ground state, on the basis of Bohr’s model, will be about

What is the ratio of the shortest wavelength of the Balmer series to the shortest wavelength of the Lyman series?

Choose the correct option from the following options given below:

(1) In the ground state of Rutherford's model electrons are in stable equilibrium. While in Thomson's model electrons always experience a net-force.

(2) An atom has a nearly continuous mass distribution in a Rutherford's model but has a highly non-uniform mass distribution in Thomson's model.

(3) A classical atom based on Rutherford's model is doomed to collapse.

(4) The positively charged part of the atom possesses most of the mass in Rutherford's model but not in Thomson's model.

Hydrogen atom from excited state comes to the ground by emitting a photon of wavelength $\lambda$. The value of principal quantum number 'n' of the excited state will be : (R : Rydberg constant)

Four forces are acting at a point P in equilibrium as shown in figure. The ratio of force F₁ to F₂ is 1 : x where x = _____.

The angular momentum of an electron moving in an orbit of hydrogen atom is 1.5 ℏ/π. The energy in the same orbit is nearly.

Which of the following quantum numbers are correct for the outermost electron of sodium atom?

How many nodal planes are there in the atomic orbitals for the principal quantum number n = 3?

For the electrons of oxygen atom, which of the following statements is correct?

Two electrons present in M shell will differ in

A certain orbital has no angular nodes and two radial nodes. The orbital is

The structure of product X in the following reaction is

How many nodal planes are there in the atomic orbitals for the principal quantum number n = 3?

The electronic states X and Y of an atom are depicted below: X : 1s²2s²2p⁶3s¹ Y : 1s²2s²2p⁶3s²3p⁶4s¹ Which of the following statements is not correct?

The formation of the oxide ion, O₂−(g), from oxygen atom requires first an exothermic and then an endothermic step as shown below : O(g) + e− → O−(g); ΔH° = −141 kJ mol−1 Ω−(g) + e− → O₂−(g); ΔH° = +780 kJ mol−1 Thus, process of formation of O₂− in gas phase is unfavourable even though O₂− is isoelectronic with neon. It is due to the fact that,

KMnO₄ acts as an oxidising agent in alkaline medium. When alkaline KMnO₄ is treated with KI, iodine is oxidised to

Which of the following is not a redox reaction?

Which of the following reactions shows the reducing property of SO₂ ? (i) Cl₂ + SO₂ → SO₂Cl₂ (ii) 2H₂S + SO₂ → 3S + 2H₂O (iii) 2FeCl₃ + SO₂ + 2H₂O → 2FeCl₂ + H₂SO₄ + 2HCl (iv) SO₂ + H₂O → H₂SO₃

H₂O₂ + H₂O₂ → 2H₂O + O₂ is an example of disproportionation because:

CH = CH - CH₃ + HBr ⟶ X, X in the reaction is:

The correct order of N⁻compounds in its decreasing order of oxidation states is

The solubility of BaSO₄ in water is 2.42 × 10⁻³ g L⁻¹ at 298 K. The value of its solubility product (Ksp) will be (Given molar mass of BaSO₄ = 233 g mol⁻¹)

Assertion : CH₃ - CH = CH - CH₃, on reaction with alcoholic KOH gives CH₃CH = CHCH₃ as a result of dehydrohalogenation. Reason : Elimination reaction takes place in accordance with Markovnikov's rule.

Which of the following statement is correct?

When KMnO₄ is reduced with oxalic acid in acidic solution, the oxidation number of Mn changes from

Which of the following sets of quantum numbers represents the highest energy of an atom?

In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as: Assertion : Sn in +2 oxidation state is a reducing agent while Pb in +4 state is an oxidising agent. Reason : Inert pair effect is due to participation of s electrons in bond formation.

The values of coefficients to balance the following reaction are Cr(OH)₃ + ClO⁻ + OH⁻ → CrO₄²⁻ + Cl⁻ + H₂O

Identify the incorrect statement. The findings from the Bohr model for H⁻atom are

Which of the following names is not correctly matched with the compound?

The major product formed in the following reaction is :

In the following structures, which one is having staggered conformation with maximum dihedral angle?

Which of the following is most stable?

Which of the following conformations of n-butane is the least stable?

The correct IUPAC nomenclature for the following compound is

On the basis of thermochemical equations (1), (2) and (3), find out which of the relationships given in options (a) to (d) is correct

1. C(graphite) + O₂(g) → CO₂(g); ΔH = x kJmol⁻¹
2. C(graphite) + 1/2 Ω₂(g) → CO(g); ΔH = y kJmol⁻¹
3. CO(g) + 1/2 Ω₂(g) → CO₂(g); ΔH = z kJmol⁻¹

An example of a disproportionation reaction is

Assertion: KMnO₄, KClO₄, and HNO₃ act as oxidants. Reason: In KMnO₄, KClO₄ and HNO₃ central atom is in its highest oxidation state.

Kₐ, Kₓ and Kₑ are the respective ionisation constants for the following reactions. H₂S ⇌ H⁺ + HS⁻ HS⁻ ⇌ H⁺ + S²⁻ H₂S ⇌ 2H⁺ + S²⁻ The correct relationship between Kₐ, Kₓ and Kₑ is

The number of radial nodes and angular nodes for d-orbital can be represented as

If K₁ and K₂ are the respective equilibrium constants for the two reactions

XeF₆(g) + H₂O(g) ⇌ XeOF₄(g) + 2HF(g)

XeO₄(g) + XeF₆(g) ⇌ XeOF₄(g) + XeO₃F₂(g)

The equilibrium constant of the reaction

XeO₄(g) + 2HF(g) ⇌ XeOF₄(g) + H₂O(g) will be

Identify disproportionation reaction

The most basic amine among the following is

Arrange the following compounds in order of their reactivity towards Sn₂ reaction.

Consider the following reaction, Phenol → Z. The product Z is

The IUPAC name for

What is the correct order of decreasing stability of the following cations?

Assertion: Aromatic aldehydes and formaldehyde undergo Cannizzaro reaction.

Reason: Aromatic aldehydes are almost as reactive as formaldehyde.

Given below are two statements.

Statement I: Iron(III) catalyst, acidified K₂Cr₂O₇ and neutral KMnO₄ have the ability to oxidise I⁻ to I₂ independently.

Statement II: Manganate ion is paramagnetic in nature and involves π-π bonding.

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

Mark the correct order of decreasing acid strength of the following compounds.