Example 1 · difficulty 3/5
Which of the following elements has the highest electronegativity on the Pauling scale, but does NOT have the most negative electron gain enthalpy among the halogens?
- A. Cl
- B. F
- C. O
- D. N
2018 source guide · Chemistry
NEET 2018 Chemistry Periodic Properties 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.
What to master
periodic trends, effective nuclear charge and anomalous behaviour.
Original practice preview
These are current-syllabus NeetVellum questions, shown separately from historical-paper provenance.
Example 2 · difficulty 4/5
Consider the following statements: (i) The first electron gain enthalpy of nitrogen is positive because the added electron must enter a 2p orbital in which all three orbitals are already singly occupied. (ii) Mg²⁺ has a smaller ionic radius than Na⁺. (iii) Electronegativity of elements increases on moving down a group. (iv) The first ionization enthalpy of boron is higher than that of beryllium. The correct statements are:
- A. (i) and (iii) only
- B. (ii) and (iii) only
- C. (i), (ii) and (iv) only
- D. (i) and (ii) only
Example 3 · difficulty 1/5
What was the main scientific need for classifying the growing number of known elements?
- A. To organise elements so that their properties could be studied systematically and related to one another
- B. To make every element react in the same manner
- C. To arrange elements only according to their physical state
- D. To replace experimentally measured properties with assumed values
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
Frequently asked questions
Are these official NEET 2018 Chemistry Periodic Properties 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.