Class 11 · Chemistry
Classification of Elements and Periodicity in Properties NEET Questions
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Build recall in Classification of Elements and Periodicity in Properties through active solving. This bank covers the complete chapter with original NEET-style MCQs, worked explanations and chapter-level NCERT provenance—without pretending original questions are previous-year questions.
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Three examples from the live 100-question bank. Answers appear after attempting them in practice mode.
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 chapter mastery loop
- 1. Attempt firstExpose recall gaps before rereading.
- 2. Classify the missConcept, careless, rushed or guessed.
- 3. Re-practiceReturn until the error pattern disappears.
Frequently asked questions
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How should I revise Classification of Elements and Periodicity in Properties for NEET?
Attempt questions before rereading, classify each miss, revisit the exposed NCERT concept, then re-practice until the error pattern disappears.