Latest questions in this category.
In S₈ + 12OH^- -> 4S^{2- + 2S₂O₃^{2- + 6H₂O, S (0) splits: -2 (reduced), +2 (oxidized), a disproportionation. 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.
[Ni(CN)4]^{2- (Ni²âº, d⸠) with strong field CN^- in a square planar geometry is low spin, with 0 unpaired electrons, making it diamagnetic. 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.
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.
Given: Which lanthanoid has an electronic configuration of 4f^{14 5d¹ 6s² in its ground state? These values define the system as per NCERT data. Formula: Lutetium (Lu, Z = 71) has 4f^{14 5d¹ 6s², marking the end of the lanthanoid series.. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Substituting values like 1.2 × 10â»âµ, 236 J kgâ»Â¹ Kâ»Â¹, CH₃CHâ‚‚NHâ‚‚ etc. into the formula and simplifying step by step. Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kgâ»Â¹ Kâ»Â¹, m/s², 10â»âµ 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.
Ethanamine ( CH₃CH₂NH₂ ) reacts with acetic acid ( CH₃COOH ) under dehydration conditions to form CH₃CONHCH₂CH₃ (N-ethylacetamide). 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.
Alkynes follow the general formula C_nH_{2n-2, as they contain a triple bond. 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.
Given: The vapor pressure of pure water at 298 K is 23.8 mm Hg. What is the vapor pressure of a solution containing 30 g of sucrose ( Câ‚â‚‚Hâ‚‚â‚‚Oâ‚â‚ ) in 270 g of water? (Molar mass: Câ‚â‚‚Hâ‚‚â‚‚Oâ‚â‚ = 342 g/mol ) These values define the system as per NCERT data. Formula: Moles of sucrose = 30/342 = 0.0877 mol. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Moles of water = 270/18 = 15 mol . Mole fraction of water = 15/15 + 0.0877 = 0.994 . Vapor pressure = 0.994 × 23.8 = 23.66 mm Hg . Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kgâ»Â¹ Kâ»Â¹, m/s², 10â»âµ are properly used as per NCERT.
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.
Kâ‚‚MnOâ‚„ contains the manganate ion MnOâ‚„^{2-, which is green due to its electronic structure (Mn in +6 state). 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.
Boiling point increases with molecular weight and van der Waals forces. 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.
DIBAL-H (Diisobutylaluminium hydride) is used for the selective reduction of carboxylic acids and esters to aldehydes. 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.
5Fe^{2+ + MnOâ‚„^- + 8H^+ -> Mn^{2+ + 4Hâ‚‚O + 5Fe^{3+ . Fe^{2+ from FeSOâ‚„ is oxidized to Fe^{3+ . 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.
NOâ‚‚+ (nitronium ion) is electron-deficient and accepts electron pairs, making it an electrophile. 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.
