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Ionisation Enthalpy, Electron Gain & Electronegativity NEET

NEET-focused practice for ionisation enthalpy, electron gain and electronegativity. Topic-wise MCQs with answers, stepwise explanations and quick chapter revision.

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Ionisation Enthalpy Electron Gain and Electronegativity Revision Guide for NEET Chemistry

Ionisation Enthalpy Electron Gain and Electronegativity is part of NEET Chemistry preparation. A strong revision plan should combine concept review with exam-style questions so that definitions, relationships, calculations and exceptions are recalled accurately.

Use the sample MCQs on this page to check understanding, then attempt the related ChemNexa tests for broader practice. When an answer is wrong, review the explanation and return to the underlying concept before attempting another set.

Important Topics

  • Core definitions and principles
  • Important equations or relationships
  • Common applications and examples
  • Frequently confused concepts
  • Exam-style multiple-choice questions
  • Error review and targeted revision

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What to practise in Ionisation Enthalpy Electron Gain and Electronegativity

Concept Revision

Revise definitions, principles, equations, trends and core ideas from Ionisation Enthalpy Electron Gain and Electronegativity before attempting MCQs.

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Top 20 Ionisation Enthalpy Electron Gain and Electronegativity MCQs with Answers

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NEET Chemistry · Ionisation Enthalpy Electron Gain and Electronegativity · Very Very Hard

1. Which principle is essential when solving a quantitative problem in Ionisation Enthalpy Electron Gain and Electronegativity?

  • A. Ignoring units
  • B. Assuming all coefficients are unity
  • C. Ignoring limiting conditions
  • D. Conservation of mass and charge where applicable
Answer: D
Explanation: Mass and charge conservation are fundamental.

NEET Chemistry · Ionisation Enthalpy Electron Gain and Electronegativity · Very Very Hard

2. At equilibrium in a reversible system related to Ionisation Enthalpy Electron Gain and Electronegativity, which statement is correct?

  • A. Reactant and product concentrations must be equal
  • B. The catalyst is consumed
  • C. Forward and reverse rates are equal
  • D. All molecular motion stops
Answer: C
Explanation: Dynamic equilibrium has equal forward and reverse rates.

NEET Chemistry · Ionisation Enthalpy Electron Gain and Electronegativity · Very Very Hard

3. For a spontaneous process at constant T and P in a Ionisation Enthalpy Electron Gain and Electronegativity context, ΔG is:

  • A. Always equal to ΔH
  • B. Negative
  • C. Positive
  • D. Always zero
Answer: B
Explanation: Spontaneity at constant T,P requires ΔG<0.

NEET Chemistry · Ionisation Enthalpy Electron Gain and Electronegativity · Very Very Hard

4. Which statement about a catalyst in Ionisation Enthalpy Electron Gain and Electronegativity is correct?

  • A. It lowers the activation barrier without changing K at fixed T
  • B. It changes ΔG°
  • C. It changes reaction enthalpy
  • D. It is always consumed
Answer: A
Explanation: Catalysts affect kinetics, not equilibrium thermodynamics.

NEET Chemistry · Ionisation Enthalpy Electron Gain and Electronegativity · Very Very Hard

5. Oxidation in a redox step relevant to Ionisation Enthalpy Electron Gain and Electronegativity means:

  • A. Gain of electrons
  • B. No oxidation-number change
  • C. Only gain of hydrogen
  • D. Loss of electrons
Answer: D
Explanation: Oxidation is electron loss.

NEET Chemistry · Ionisation Enthalpy Electron Gain and Electronegativity · Very Very Hard

6. Reduction in a redox step relevant to Ionisation Enthalpy Electron Gain and Electronegativity means:

  • A. Increase in oxidation number
  • B. Only loss of hydrogen
  • C. Gain of electrons
  • D. Loss of electrons
Answer: C
Explanation: Reduction is electron gain.

NEET Chemistry · Ionisation Enthalpy Electron Gain and Electronegativity · Very Very Hard

7. A Lewis acid encountered in Ionisation Enthalpy Electron Gain and Electronegativity is an:

  • A. Anion only
  • B. Electron-pair acceptor
  • C. Electron-pair donor
  • D. Proton acceptor only
Answer: B
Explanation: Lewis acids accept electron pairs.

NEET Chemistry · Ionisation Enthalpy Electron Gain and Electronegativity · Very Very Hard

8. A Lewis base encountered in Ionisation Enthalpy Electron Gain and Electronegativity is an:

  • A. Electron-pair donor
  • B. Electron-pair acceptor
  • C. Cation only
  • D. Oxidising agent only
Answer: A
Explanation: Lewis bases donate electron pairs.

NEET Chemistry · Ionisation Enthalpy Electron Gain and Electronegativity · Very Very Hard

9. Which is a state function useful in Ionisation Enthalpy Electron Gain and Electronegativity?

  • A. Heat
  • B. Work
  • C. Path length
  • D. Enthalpy
Answer: D
Explanation: Enthalpy is path independent.

NEET Chemistry · Ionisation Enthalpy Electron Gain and Electronegativity · Very Very Hard

10. The relation between standard Gibbs energy and equilibrium constant is:

  • A. ΔG°=-KRT
  • B. ΔG°=RT/K
  • C. ΔG°=-RT lnK
  • D. ΔG°=RT lnK
Answer: C
Explanation: The standard thermodynamic relation is ΔG°=-RT lnK.

NEET Chemistry · Ionisation Enthalpy Electron Gain and Electronegativity · Very Very Hard

11. For a first-order kinetic process in Ionisation Enthalpy Electron Gain and Electronegativity, half-life equals:

  • A. [A]0/(2k)
  • B. 0.693/k
  • C. k/0.693
  • D. 1/(k[A]0)
Answer: B
Explanation: First-order t1/2=0.693/k.

NEET Chemistry · Ionisation Enthalpy Electron Gain and Electronegativity · Very Very Hard

12. The Arrhenius equation is:

  • A. k=Ae^(-Ea/RT)
  • B. k=Ae^(Ea/RT)
  • C. k=EaRT
  • D. k=A/RT
Answer: A
Explanation: Arrhenius equation relates k to activation energy and temperature.

NEET Chemistry · Ionisation Enthalpy Electron Gain and Electronegativity · Very Very Hard

13. For an ideal dilute solution relevant to Ionisation Enthalpy Electron Gain and Electronegativity, molarity is:

  • A. Moles solute per kg solvent
  • B. Grams solute per mole solvent
  • C. Moles solvent per litre
  • D. Moles solute per litre solution
Answer: D
Explanation: M=n/V(L).

NEET Chemistry · Ionisation Enthalpy Electron Gain and Electronegativity · Very Very Hard

14. For a weak acid, a larger Ka generally indicates:

  • A. No ionisation
  • B. A stronger conjugate acid
  • C. A stronger acid
  • D. A weaker acid
Answer: C
Explanation: Larger Ka means greater ionisation.

NEET Chemistry · Ionisation Enthalpy Electron Gain and Electronegativity · Very Very Hard

15. At 25°C, pH+pOH for aqueous solution is:

  • A. 0
  • B. 14
  • C. 7
  • D. 1
Answer: B
Explanation: pH+pOH=pKw=14 at 25°C.

NEET Chemistry · Ionisation Enthalpy Electron Gain and Electronegativity · Very Very Hard

16. For an electrochemical cell, oxidation occurs at:

  • A. Anode
  • B. Cathode
  • C. Salt bridge
  • D. Electrolyte only
Answer: A
Explanation: Oxidation occurs at the anode.

NEET Chemistry · Ionisation Enthalpy Electron Gain and Electronegativity · Very Very Hard

17. For an electrochemical cell, reduction occurs at:

  • A. Anode
  • B. Salt bridge
  • C. Wire
  • D. Cathode
Answer: D
Explanation: Reduction occurs at the cathode.

NEET Chemistry · Ionisation Enthalpy Electron Gain and Electronegativity · Very Very Hard

18. A positive E°cell implies:

  • A. K<1 necessarily
  • B. No spontaneous reaction
  • C. ΔG°<0
  • D. ΔG°>0
Answer: C
Explanation: ΔG°=-nFE°.

NEET Chemistry · Ionisation Enthalpy Electron Gain and Electronegativity · Very Very Hard

19. Higher bond order generally corresponds to:

  • A. No bond-length effect
  • B. Shorter stronger bond
  • C. Longer weaker bond
  • D. Longer stronger bond
Answer: B
Explanation: Higher bond order strengthens and shortens bonds.

NEET Chemistry · Ionisation Enthalpy Electron Gain and Electronegativity · Very Very Hard

20. A nucleophile in an organic reaction related to Ionisation Enthalpy Electron Gain and Electronegativity is:

  • A. Electron-pair donor
  • B. Electron-pair acceptor
  • C. Always positively charged
  • D. Always a radical
Answer: A
Explanation: Nucleophiles donate electron pairs.

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Ionisation Enthalpy Electron Gain and Electronegativity Practice Tests

Ionisation Enthalpy Electron Gain and Electronegativity Frequently Asked Questions

How should I prepare Ionisation Enthalpy Electron Gain and Electronegativity for NEET Chemistry?

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