CHEMISTRY

CHEMISTRY

Which complex shows ionization isomerism with [Co(NH₃)5NO₂]Cl₂ ?

[Co(NH₃)5Cl]NO₂Cl swaps Cl^- and NO₂^- with [Co(NH₃)5NO₂]Cl₂, exhibiting ionization isomerism. 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.

View Details

CHEMISTRY

Which complex shows optical isomerism?

[PtCl₂(en)2]^{2+ (cis isomer) with two bidentate en ligands in a square planar geometry is chiral, showing optical isomerism (d and l forms). 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.

View Details

CHEMISTRY

What is the oxidation number of Mn in KMnO₄ ?

K is +1, O is -2. Sum is zero: +1 + x + 4(-2) = 0, 1 + x - 8 = 0, x = +7 . 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.

View Details

CHEMISTRY

What is the formal charge on the carbon atom in the CO molecule?

In CO, carbon has 1 triple bond (6 electrons) and 1 lone pair (2 electrons). Formal charge = 4 - 2 - 1/2 × 6 = -1. 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: Electrochemistry (Latest NCERT 2026-27), Topic: Faraday's laws, charge required to reduce Al³⁺, 3F = 3 × 96500 C

View Details

CHEMISTRY

For N₂(g) + 2O₂(g) 2NO₂(g), K_c = 0.01 at 500 K. What is K_c for the reverse reaction?

Given: For N₂(g) + 2O₂(g) 2NO₂(g), K_c = 0.01 at 500 K. What is K_c for the reverse reaction? Formula: For reverse reaction 2NO₂(g) N₂(g) + 2O₂(g), K_c' = 1/K_c = 1/0.01 = 100 .. Substitution: Substituting given values into formula as per NCERT 2026-27 method. Calculation: Simplifying step by step with proper SI units like m/s², J kg⁻¹ K⁻¹, 10⁻⁵, A m⁻¹ etc. Final Result: The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.

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.

View Details

CHEMISTRY

How many electrons are involved in the reduction of 1 mol of Cu²⁺ to Cu(s)?

Given: How many electrons are involved in the reduction of 1 mol of Cu²⁺ to Cu(s)? Formula: Reaction: Cu²+ + 2e- -> Cu(s). Substitution & Calculation: 2 electrons are required per mole of Cu²⁺. Final Result: The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.

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.

View Details

CHEMISTRY

The K_{sp of Hg₂Cl₂ is 1.3 × 10⁻¹⁸. What is its solubility in water?

Given: The K_{sp of Hg₂Cl₂ is 1.3 × 10⁻¹⁸. What is its solubility in water? Formula: Hg₂Cl₂(s) Hg₂²+ + 2Cl-, K_{sp = S · (2S)² = 4S³. Substitution & Calculation: 4S³ = 1.3 × 10⁻¹⁸, S³ = 3.25 × 10⁻¹⁹, S approx 6.88 × 10⁻⁷M. Final Result: The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.

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.

View Details

CHEMISTRY

For the reaction 2A -> 3B, the concentration of A decreases from 0.24 M to 0.20 M in 40 seconds. What is the average rat

Given: For the reaction 2A -> 3B, the concentration of A decreases from 0.24 M to 0.20 M in 40 seconds. What is the average rate of formation of B in mol L^{-1 s^{-1 ? Formula: Rate = -1/2 fracΔ[A]Δ t = 1/3 fracΔ[B]Δ t. Substitution & Calculation: Δ[A] = 0.20 - 0.24 = -0.04 mol L^{-1, Δ t = 40 s . -fracΔ[A]Δ t = 0.001, so fracΔ[B]Δ t = 3/2 × 0.001 = 1.5 × 10⁻³. Final Result: The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.

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.

View Details

CHEMISTRY

What is the mass percentage of a solution formed by mixing 120 g of a 20% (w/w) solution with 180 g of a 10% (w/w) solut

Given: What is the mass percentage of a solution formed by mixing 120 g of a 20% (w/w) solution with 180 g of a 10% (w/w) solution? Formula: Mass of solute from first = 0.20 × 120 = 24 g. Substitution & Calculation: Mass of solute from second = 0.10 × 180 = 18 g . Total solute = 24 + 18 = 42 g. Total mass = 120 + 180 = 300 g. Mass % = 42/300 × 100 = 14% . Final Result: The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.

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.

View Details

CHEMISTRY

What is the bond angle around the nitrogen atom in CH₃NH₂ ?

The nitrogen in CH₃NH₂ is sp³ hybridized (3 bonds, 1 lone pair), resulting in a tetrahedral electron geometry, but a bond angle of approximately 107° due to lone pair repulsion.

Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII), Chapter: Chemical Bonding (Latest NCERT 2026-27), Topic: Hybridization of nitrogen in CH₃NH₂, sp³ hybridization and pyramidal geometry

View Details

CHEMISTRY

For the reaction CO(g) + 2H₂(g) -> CH₃OH(l), if Δ H = -128.1 kJ/mol at 298 K, what is Δ U (R = 8.314 J/mol · K)?

Given: For the reaction CO(g) + 2H₂(g) -> CH₃OH(l), if Δ H = -128.1 kJ/mol at 298 K, what is Δ U (R = 8.314 J/mol · K)? Formula: Δ n_g = 0 - (1 + 2) = -2, RT = 8.314 × 298 / 1000 = 2.48 kJ. Substitution & Calculation: Δ H = Δ U + Δ n_g RT. Δ U = -128.1 - (-2 × 2.48) = -123.14 kJ/mol. Final Result: The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.

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.

View Details

CHEMISTRY

What is the mass percentage of a solution made by dissolving 30 g of K₂SO₄ in 170 g of water?

Given: What is the mass percentage of a solution made by dissolving 30 g of K₂SO₄ in 170 g of water? Formula: Total mass of solution = 30 g + 170 g = 200 g. Substitution & Calculation: Mass % = fracMass of K₂SO₄Total mass × 100 = 30/200 × 100 = 15% . Final Result: The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.

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.

View Details