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#chemistry MCQ

61 public questions tagged with this topic.

CHEMISTRY

Which of the following ions has the electronic configuration 3d³ ?

Given: Which of the following ions has the electronic configuration 3d³ ? These values define the system as per NCERT data. Formula: V (Z = 23) has 3d³ 4s². This is the standard NCERT relation for this phenomenon. Substitution & Calculation: For V^{2+, 2 electrons from 4s are lost, leaving 3d³ . Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Relevant Chemistry topic covering principles and examples as per NCERT.

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CHEMISTRY

The catalytic property of transition metals is due to:

Variable oxidation states allow transition metals to facilitate electron transfer in catalytic reactions. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom and Periodicity, Topic: Mole concept, atomic models and periodic trends.

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CHEMISTRY

Which of the following is NOT a method for the preparation of ethers?

Ethers can be prepared by Williamson synthesis, acid-catalyzed dehydration of alcohols, and alkoxymercuration-demercuration. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII)Topic: Mole concept, atomic structure, chemical formulas like H₂O, CO₂, CH₃CH₂NH₂ and periodic trends.

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CHEMISTRY

What is the overall reaction in a mercury ll during discharge?

Anode: Zn(Hg) + 2OH- -> ZnO(s) + Hâ‚‚O + 2e- . Cathode: HgO + Hâ‚‚O + 2e- -> Hg(l) + 2OH- . Overall: Zn(Hg) + HgO(s) -> ZnO(s) + Hg(l) . This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Relevant Chemistry topic covering principles and examples as per NCERT.

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CHEMISTRY

Which of the following ions is colored due to d-d transitions?

Ni^{2+ (Z = 28): 3d⁸ . Partially filled d orbitals allow d-d transitions, causing a green color in aqueous solution. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII), Chapter: Coordination Compounds and d Block Elements (Latest NCERT 2026-27), Topic: Colour of [Ti(H₂O)₆]³⁺, crystal field theory and d-d transition

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CHEMISTRY

Which of the following reagents is used for the decarboxylation of carboxylic acids?

Soda lime (NaOH + CaO) is commonly used to remove the carboxyl group from carboxylic acids, forming hydrocarbons. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom and Periodicity, Topic: Mole concept, atomic models and periodic trends.

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