2018 source guide · Chemistry

NEET 2018 Chemistry Questions

Use this page to connect the official 2018 paper with current Chemistry practice. NeetVellum does not claim a chapter appeared in that paper until the official question and final key have been mapped.

Practice 2196 verified questions →Check official NTA archive ↗

Original practice preview

These are current-syllabus NeetVellum questions, shown separately from historical-paper provenance.

Example 1 · difficulty 3/5

Applying molecular orbital theory to the superoxide ion O₂⁻ (17 electrons), its calculated bond order and magnetic behaviour are:

A. Bond order 1.5, paramagnetic
B. Bond order 2.5, paramagnetic
C. Bond order 2.0, diamagnetic
D. Bond order 1.0, diamagnetic

Example 2 · difficulty 3/5

NH₃ (μ ≈ 1.47 D) and NF₃ (μ ≈ 0.24 D) are both pyramidal molecules with sp³-hybridised nitrogen, yet their dipole moments differ enormously. The correct explanation is:

A. NF₃ is planar triangular while NH₃ is pyramidal, so NF₃ achieves complete internal cancellation of bond dipoles
B. The N–F bond is longer than the N–H bond, which lowers the product of effective charge and distance in NF₃
C. Fluorine atoms pull the nitrogen lone pair entirely onto themselves, eliminating its contribution to the dipole
D. In NH₃ the N–H bond moments point toward the lone-pair side and reinforce it, whereas in NF₃ the N–F bond moments point away and oppose the lone-pair moment

Example 3 · difficulty 4/5

For the species NO₂⁺, NO₂ and NO₂⁻, the correct decreasing order of the O–N–O bond angle is:

A. NO₂⁻ > NO₂ > NO₂⁺
B. NO₂⁺ > NO₂ > NO₂⁻
C. NO₂ > NO₂⁺ > NO₂⁻
D. NO₂ > NO₂⁻ > NO₂⁺

The evidence-first practice loop

1. Verify provenanceOfficial paper and final key before accepting a PYQ label.
2. Attempt closed-bookExpose the concept or execution gap before rereading.
3. Repair and returnClassify the miss and re-practice after a delay.

Canonical chapter practice

Some Basic Concepts of Chemistry →Structure of Atom →Classification of Elements and Periodicity in Properties →Chemical Bonding and Molecular Structure →Thermodynamics →Equilibrium →Redox Reactions →Organic Chemistry: Some Basic Principles and Techniques →Hydrocarbons →Solutions →Electrochemistry →Chemical Kinetics →The d- and f-Block Elements →Coordination Compounds →Haloalkanes and Haloarenes →Alcohols, Phenols and Ethers →Aldehydes, Ketones and Carboxylic Acids →Amines →Biomolecules →

Frequently asked questions

Are these official NEET 2018 Chemistry PYQs?

No. The previews are original NeetVellum practice questions. A historical item receives a PYQ label only after its official paper and authoritative final answer key are attached. Use the official archive for the source paper.

How should I use the NEET 2018 paper?

Solve the official paper under its original timing, verify against the final key, classify every miss, and then use the linked current-syllabus practice bank to repair the exposed concept.