Latest questions in this category.
For a square planar [Ma b c d] complex, 3 geometrical isomers are possible by varying the relative positions of the four different ligands. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom, Periodicity and relevant Chemistry topic, Topic: Mole concept and periodic trends.
Kolbe’s reaction involves the reaction of phenoxide ion with carbon dioxide to form salicylic acid. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom, Periodicity and relevant Chemistry topic, Topic: Mole concept and periodic trends.
Propanenitrile ( CH₃CH₂CN ) is reduced to propan-1-amine ( CH₃CH₂CH₂NH₂ ) using H₂/Ni, a common method for nitrile reduction. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom, Periodicity and relevant Chemistry topic, Topic: Mole concept and periodic trends.
Tertiary halides react the slowest in S_N₂ reactions due to steric hindrance. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom, Periodicity and relevant Chemistry topic, Topic: Mole concept and periodic trends.
Given: Which element has the configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 3d^{10 4s² 4p⁶? These values define the system as per NCERT data. Formula: Total electrons = 2 + 2 + 6 + 2 + 6 + 10 + 2 + 6 = 36, corresponding to krypton (Z = 36).. This is standard NCERT relation. Substitution & Calculation: Substituting values and simplifying step by step as per NCERT method. Result: The computed value matches expected outcome and confirms correct choice as per NCERT.
Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom, Periodicity and relevant Chemistry topic, Topic: Mole concept and periodic trends.
Given: The number of unpaired electrons in Mn^{2+ (Z = 25) is: These values define the system as per NCERT data. Formula: Mn: 3d⁵ 4s². This is standard NCERT relation. Substitution & Calculation: Mn^{2+ : 3d⁵ . All 5 electrons are unpaired in the 3d orbitals, per Hund’s rule. Result: The computed value matches expected outcome and confirms correct choice as per NCERT.
Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom, Periodicity and relevant Chemistry topic, Topic: Mole concept and periodic trends.
Given: For a reaction with Δ H = -50 kJ/mol and Δ S = 0.25 kJ/K · mol, at what temperature is Δ G = 0? These values define the system as per NCERT data. Formula: At equilibrium, Δ G = 0, so Δ H - TΔ S = 0. This is standard NCERT relation. Substitution & Calculation: T = Δ H / Δ S = -50 / 0.25 = 200 K. Result: The computed value matches expected outcome and confirms correct choice as per NCERT.
Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom, Periodicity and relevant Chemistry topic, Topic: Mole concept and periodic trends.
Freons are responsible for the depletion of the ozone layer. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom, Periodicity and relevant Chemistry topic, Topic: Mole concept and periodic trends.
Adrenaline (epinephrine), an amino acid-derived hormone, is secreted by the adrenal medulla to prepare the body for fight-or-flight responses. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom, Periodicity and relevant Chemistry topic, Topic: Mole concept and periodic trends.
For an octahedral complex of type [Ma₃b3], two geometrical isomers are possible: facial (fac), where three identical ligands occupy one face, and meridional (mer), where they lie in a plane.
Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom, Periodicity and relevant Chemistry topic, Topic: Mole concept and periodic trends.
Given: For 2H₂O(g) 2H₂(g) + O₂(g), decreasing volume will: These values define the system as per NCERT data. Formula: Δ n = (2 + 1) - 2 = 1. This is standard NCERT relation. Substitution & Calculation: Decreasing volume (increasing pressure) shifts to reactants (fewer moles). Result: The computed value matches expected outcome and confirms correct choice as per NCERT.
Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom, Periodicity and relevant Chemistry topic, Topic: Mole concept and periodic trends.
The electrolyte is a concentrated aqueous sodium hydroxide solution. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom, Periodicity and relevant Chemistry topic, Topic: Mole concept and periodic trends.
