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Classification of elements and Periodicity in properties MCQs for NEET — Chemistry Questions with Answers

Practice free Classification of elements and Periodicity in properties (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

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What is the primary reason scientists felt the need to classify elements?

A. To make elements radioactive B. To synthesize new elements more easily C. To systematically organize knowledge and predict new chemical facts D. To prevent the discovery of new elements

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Explanation

The text explains: 'To ease out this problem, scientists searched for a systematic way to organise their knowledge by classifying the elements. Not only that it would rationalize known chemical facts about elements, but even predict new ones for undertaking further study.'

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Dmitri Mendeleev's Periodic Table was primarily based on arranging elements in increasing order of their:

A. Atomic number B. Electron configuration C. Atomic mass D. Valency

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Explanation

The summary section clearly states: 'Mendeleevâ€™s Periodic table was based on atomic masses.'

NEET 2023

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The element expected to form largest ion to achieve the nearest noble gas configuration is:

A. O B. F C. N D. Na

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Explanation

N gains 3 electrons to give $N^{3-}$ (isoelectronic with Ne) — largest among the listed ions because of greatest electron-electron repulsion / lowest $Z_{eff}$.

NEET 2023

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Taking stability as the factor, which one of the following represents correct relationship?

A. $\text{TlCl}_3 > \text{TlCl}$ B. $\text{InI}_3 > \text{InI}$ C. $\text{AlCl} > \text{AlCl}_3$ D. $\text{TlI} > \text{TlI}_3$

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Explanation

Inert pair effect: for Tl, +1 state is more stable than +3 → TlI more stable than TlI₃.

NEET 2023

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Which one of the following statements is correct?

A. The daily requirement of Mg and Ca in the human body is estimated to be 0.2–0.3 g. B. All enzymes that utilise ATP in phosphate transfer require Ca as the cofactor. C. The bone in human body is an inert and unchanging substance. D. Mg plays roles in neuromuscular function and interneuronal transmission.

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Explanation

Mg²⁺ is required for neuromuscular contraction and nerve impulse transmission.

NEET 2023

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Given below are two statements: one is labelled Assertion A and the other Reason R.

A: Metallic sodium dissolves in liquid ammonia giving a deep blue solution, which is paramagnetic.

R: The deep blue solution is due to the formation of amide.

A. Both A and R true; R correct explanation of A. B. Both A and R true; R NOT the correct explanation. C. A is true but R is false. D. A is false but R is true.

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Explanation

Blue colour due to ammoniated electron, not amide. A correct; R false.

NEET 2023

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A: Helium is used to dilute oxygen in diving apparatus. R: Helium has high solubility in O₂.

A. Both A and R true; R correct explanation. B. Both A and R true; R NOT correct explanation. C. A is true but R is false. D. A is false but R is true.

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Explanation

A correct. R wrong — He is used because of its LOW solubility in blood at high pressure, not high solubility in O₂.

NEET 2024

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Arrange the following elements in increasing order of first ionization enthalpy: Li, Be, B, C, N.

Choose the correct answer from the options given below:

A. Li < Be < N < B < C B. Li < Be < B < C < N C. Li < B < Be < C < N D. Li < Be < C < B < N

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Explanation

Be > B (filled 2s); N > C (half-filled 2p). Order: Li < B < Be < C < N.

NEET 2024

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Among Group 16 elements, which one does NOT show $-2$ oxidation state?

A. Po B. O C. Se D. Te

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Explanation

Po is the most metallic Group 16 element and does not exhibit a stable $-2$ state.

NEET 2024

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Given below are two statements:

Statement I: The boiling point of hydrides of Group 16 elements follow the order $H_2O > H_2Te > H_2Se > H_2S$.

Statement II: On the basis of molecular mass, $H_2O$ is expected to have lower boiling point than the other members of the group but due to the presence of extensive H-bonding in $H_2O$, it has higher boiling point.

In the light of the above statements, choose the correct answer from the options given below:

A. Statement I is false but Statement II is true. B. Both Statement I and Statement II are true. C. Both Statement I and Statement II are false. D. Statement I is true but Statement II is false.

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Explanation

Anomalous H-bonding makes H₂O's bp the highest in the family.

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