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NEET UG Chemical Thermodynamics — practice questions

Explore 45 free Chemical Thermodynamics questions in NEET UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Chemical Thermodynamics questions and exercises with answers

Showing questions 1–30 of 45.

In Rutherford's α-particle scattering experiment, the principal conclusion was that:Read the answer and worked solution →The wavelength λ associated with a particle of momentum p (de Broglie hypothesis) is:Read the answer and worked solution →According to Bohr's model, the radius of the n-th orbit in a hydrogen atom is proportional to:Read the answer and worked solution →The energy of the n-th orbit in a hydrogen atom (Bohr) varies as:Read the answer and worked solution →When an electron in a hydrogen atom transitions from n = 3 to n = 2, the emitted photon belongs to the:Read the answer and worked solution →The four quantum numbers (n, ℓ, m_ℓ, m_s) for the last electron of sodium (Z = 11) in its ground state are:Read the answer and worked solution →Pauli's exclusion principle states that:Read the answer and worked solution →Hund's rule of maximum multiplicity says that in a set of degenerate orbitals:Read the answer and worked solution →The maximum number of electrons that can occupy the 4th principal shell (n = 4) is:Read the answer and worked solution →The shape of a 2p orbital is:Read the answer and worked solution →The Heisenberg uncertainty principle states that the product Δx · Δp is at least of the order of:Read the answer and worked solution →The ground-state electronic configuration of Cu (Z = 29) is:Read the answer and worked solution →An electron in a hydrogen atom falls from n = 4 to n = 2. The wavelength of the emitted photon (R_H = 1.097 × 10⁷ m⁻¹) is closest to:Read the answer and worked solution →The number of radial nodes in a 3s orbital is:Read the answer and worked solution →Isotopes of an element differ in:Read the answer and worked solution →A covalent bond involves:Read the answer and worked solution →According to VSEPR theory, the geometry of CH₄ around the carbon atom is:Read the answer and worked solution →The geometry of water (H₂O) is:Read the answer and worked solution →The hybridisation of carbon in ethylene (C₂H₄) is:Read the answer and worked solution →The hybridisation of nitrogen in ammonia (NH₃) is:Read the answer and worked solution →Among HF, HCl, HBr and HI, the molecule with the highest dipole moment is:Read the answer and worked solution →The maximum number of bonds an oxygen atom can normally form is:Read the answer and worked solution →Bond order in molecular orbital theory is defined as:Read the answer and worked solution →Among N₂, O₂, F₂ and Ne₂, the molecule with the highest bond order is:Read the answer and worked solution →Which of the following diatomic species is paramagnetic in its ground state?Read the answer and worked solution →In a coordinate (dative) bond, the shared pair of electrons:Read the answer and worked solution →Among the following, the molecule with a zero dipole moment despite polar bonds is:Read the answer and worked solution →At chemical equilibrium in a closed system:Read the answer and worked solution →For the reaction aA + bB ⇌ cC + dD, the equilibrium constant K_c is defined as:Read the answer and worked solution →If for a reaction K_p has units of atm² and Δn = 2, the relation between K_p and K_c is:Read the answer and worked solution →

Worked practice questions

In Rutherford's α-particle scattering experiment, the principal conclusion was that:

  1. Atoms are indivisible spheres
  2. Electrons orbit in fixed shells
  3. Mass and charge sit in a tiny nucleus
  4. Energy is quantised in atoms
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Correct answer: C. Mass and charge sit in a tiny nucleus

1. A small fraction of α-particles bounced almost straight back from a thin gold foil. 2. This required a very small, dense, positively charged centre — the nucleus. 3. Most α-particles passed undeviated, so the atom is mostly empty space. 4. Quantisation came from Bohr (1913), not Rutherford. _Source: syllabus Chem Ch 2 §2.2 Atomic Models — Rutherford_

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The wavelength λ associated with a particle of momentum p (de Broglie hypothesis) is:

  1. λ = h / p
  2. λ = h p
  3. λ = p / h
  4. λ = h² / p
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Correct answer: A. λ = h / p

1. de Broglie postulated wave–particle duality: every moving particle has an associated wave. 2. The wavelength is λ = h / p, where h is Planck's constant. 3. For an electron with kinetic energy K, p = √(2 m K), so λ = h / √(2 m K). _Source: syllabus Chem Ch 2 §2.6 Dual Behaviour of Matter_

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According to Bohr's model, the radius of the n-th orbit in a hydrogen atom is proportional to:

  1. n
  2. n²
  3. 1 / n
  4. 1 / n²
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Correct answer: B. n²

1. Bohr quantised angular momentum: m v r = n h / (2π). 2. Combined with the Coulomb-centripetal balance gives r_n = n² a₀ for hydrogen, where a₀ ≈ 52.9 pm. 3. So radius scales as n². _Source: syllabus Chem Ch 2 §2.4 Bohr's Model_

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