Current-syllabus practice · Chemistry

NEET Chemistry Periodic Properties Questions

Periodic Properties practice focused on periodic trends, effective nuclear charge and anomalous behaviour.

Practice 150 verified questions →

150 original questions · explicit provenance labels

ChemistryPlate 59

NeetVellum atlas · fig. chemistry

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 1 · difficulty 1/5

According to Dobereiner's law of triads, the atomic mass of the middle element of a triad is approximately the arithmetic mean of the atomic masses of the other two elements. Given atomic masses Li = 7, Na = 23, K = 39; F = 19, Cl = 35.5, Br = 80; He = 4, Ne = 20, Ar = 40; N = 14, P = 31, As = 75, which of the following is a valid Dobereiner triad?

A. F, Cl, Br
B. He, Ne, Ar
C. Li, Na, K
D. N, P, As

Example 2 · difficulty 2/5

The species O²⁻, F⁻, Na⁺, Mg²⁺ and Al³⁺ are isoelectronic. The correct order of their ionic radii is:

A. O²⁻ > F⁻ > Na⁺ > Mg²⁺ > Al³⁺
B. Al³⁺ > Mg²⁺ > Na⁺ > F⁻ > O²⁻
C. Na⁺ > Mg²⁺ > Al³⁺ > O²⁻ > F⁻
D. F⁻ > O²⁻ > Na⁺ > Al³⁺ > Mg²⁺

Example 3 · difficulty 3/5

The first ionization enthalpy of boron (801 kJ mol⁻¹) is lower than that of beryllium (899 kJ mol⁻¹) even though boron has a higher nuclear charge. The correct explanation is:

A. the boron atom is larger in size than the beryllium atom
B. the electron removed from boron is a 2p electron, which is less penetrating and shielded by the 2s² electrons, so it is held less firmly
C. boron has a stable half-filled 2p subshell, so it loses an electron easily
D. beryllium loses its electron from the 2p orbital, which lies closer to the nucleus

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

Classification of Elements and Periodicity in Properties →

Frequently asked questions

How many Periodic Properties NEET questions are available?

NeetVellum currently publishes 150 original, verified questions across the linked canonical chapter.

How should I revise Periodic Properties for NEET?

Attempt questions before rereading, classify each miss, repair the specific concept, and re-practice after a delay until the error pattern disappears.