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p-Block (Groups 17 & 18) NEET Practice

Practice NEET-style MCQs on halogens and noble gases with step-by-step solutions, concise chapter revision and related ChemNexa mock tests.

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p-Block Group 17 and 18 Revision Guide for NEET Chemistry

p-Block Elements covers periodic trends, structures, oxidation states and important compounds of groups 13 to 18 depending on the syllabus. Questions often test trends together with exceptions.

For NEET Chemistry, organise revision group-wise and compare oxidation states, acidic or basic character, anomalous behaviour, structures and important reactions.

Important Topics

  • Group-wise periodic trends
  • Anomalous behaviour of first elements
  • Oxidation states and inert-pair effect
  • Structures of important compounds
  • Acidic and basic character
  • Important reactions and uses

Revision Tip

Create a one-page summary of trends, structures, reactions, exceptions and key terminology for p-Block Group 17 and 18, then test recall with mixed MCQs.

What to practise in p-Block Group 17 and 18

Concept Revision

Revise definitions, principles, equations, trends and core ideas from p-Block Group 17 and 18 before attempting MCQs.

Exam-style MCQs

Use chapter-focused multiple-choice practice to improve accuracy, recall and application for NEET Chemistry.

Performance Practice

Attempt ChemNexa tests, review results and return to weak areas for another round of targeted revision.

Top 20 p-Block Group 17 and 18 MCQs with Answers

These public questions are selected from the exact p-Block Group 17 and 18 chapter, screened for topic relevance and deduplicated so repeated versions of the same MCQ are not shown publicly. Use them for quick revision, then sign in to attempt the complete test experience with more questions, results and performance review.

NEET Chemistry · p-Block Group 17 and 18 · Very Very Hard

1. Which principle is essential when solving a quantitative problem in p-Block Group 17 and 18?

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

NEET Chemistry · p-Block Group 17 and 18 · Very Very Hard

2. At equilibrium in a reversible system related to p-Block Group 17 and 18, which statement is correct?

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

NEET Chemistry · p-Block Group 17 and 18 · Very Very Hard

3. For a spontaneous process at constant T and P in a p-Block Group 17 and 18 context, ΔG is:

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

NEET Chemistry · p-Block Group 17 and 18 · Very Very Hard

4. Which statement about a catalyst in p-Block Group 17 and 18 is correct?

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

NEET Chemistry · p-Block Group 17 and 18 · Very Very Hard

5. Oxidation in a redox step relevant to p-Block Group 17 and 18 means:

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

NEET Chemistry · p-Block Group 17 and 18 · Very Very Hard

6. Reduction in a redox step relevant to p-Block Group 17 and 18 means:

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

NEET Chemistry · p-Block Group 17 and 18 · Very Very Hard

7. A Lewis acid encountered in p-Block Group 17 and 18 is an:

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

NEET Chemistry · p-Block Group 17 and 18 · Very Very Hard

8. A Lewis base encountered in p-Block Group 17 and 18 is an:

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

NEET Chemistry · p-Block Group 17 and 18 · Very Very Hard

9. Which is a state function useful in p-Block Group 17 and 18?

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

NEET Chemistry · p-Block Group 17 and 18 · Very Very Hard

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

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

NEET Chemistry · p-Block Group 17 and 18 · Very Very Hard

11. For a first-order kinetic process in p-Block Group 17 and 18, half-life equals:

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

NEET Chemistry · p-Block Group 17 and 18 · Very Very Hard

12. For an ideal dilute solution relevant to p-Block Group 17 and 18, molarity is:

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

NEET Chemistry · p-Block Group 17 and 18 · Very Very Hard

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

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

NEET Chemistry · p-Block Group 17 and 18 · Very Very Hard

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

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

NEET Chemistry · p-Block Group 17 and 18 · Very Very Hard

15. For an electrochemical cell, oxidation occurs at:

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

NEET Chemistry · p-Block Group 17 and 18 · Very Very Hard

16. For an electrochemical cell, reduction occurs at:

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

NEET Chemistry · p-Block Group 17 and 18 · Very Very Hard

17. A positive E°cell implies:

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

NEET Chemistry · p-Block Group 17 and 18 · Very Very Hard

18. Higher bond order generally corresponds to:

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

NEET Chemistry · p-Block Group 17 and 18 · Very Very Hard

19. A nucleophile in an organic reaction related to p-Block Group 17 and 18 is:

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

NEET Chemistry · p-Block Group 17 and 18 · Very Very Hard

20. An electrophile in an organic reaction related to p-Block Group 17 and 18 is:

  • A. Electron-pair acceptor
  • B. Electron-pair donor
  • C. Always negatively charged
  • D. Always a radical
Answer: A
Explanation: Electrophiles accept electron pairs.

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p-Block Group 17 and 18 Practice Tests

p-Block Group 17 and 18 Frequently Asked Questions

How should I memorise p-Block Chemistry?

Use comparison tables by group and focus on trends, important exceptions, structures and reactions instead of memorising disconnected facts.

Why are exceptions important in p-Block questions?

Small size, high electronegativity, absence of d orbitals in second-period elements and inert-pair effects create frequently tested deviations from simple trends.

What is a good revision method for p-Block?

Revise one group at a time, write the common oxidation states and key compounds, then immediately solve targeted MCQs.

Continue with another chapter to build connected concepts and strengthen your overall Chemistry preparation.

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