Current-syllabus practice · Chemistry

NEET Chemistry Periodic Properties Questions

Periodic Properties practice focused on periodic trends, effective nuclear charge and anomalous behaviour. Every preview below comes from NeetVellum's live original bank—not an unverified PYQ reconstruction.

Practice 100 verified questions →

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 100 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.