CHEMISTRY

CHEMISTRY

How many electrons are present in an ion with 16 protons, 16 neutrons, and a charge of -2?

Given: How many electrons are present in an ion with 16 protons, 16 neutrons, and a charge of -2? Formula: For a neutral atom, electrons = protons = 16. Substitution & Calculation: A charge of -2 means 2 extra electrons, so total electrons = 16 + 2 = 18. 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), Chapter: Electrochemistry (Latest NCERT 2026-27), Topic: Faraday's laws, charge required to reduce Al³⁺, 3F = 3 × 96500 C

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CHEMISTRY

What is the IUPAC name of [Cr(H₂O)6]Cl₃ ?

Given: What is the IUPAC name of [Cr(H₂O)6]Cl₃ ? Formula: The complex ion is [Cr(H₂O)6]^{3+. Substitution & Calculation: Ligand: aqua (H₂O). Cr is +3 (3 Cl⁻ balance +3 charge). Name: hexaaquachromium(III) chloride. 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), Chapter: Electrochemistry (Latest NCERT 2026-27), Topic: Faraday's laws, charge required to reduce Al³⁺, 3F = 3 × 96500 C

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CHEMISTRY

How much current (in amperes) is required to deposit 0.159 g of copper from CuSO₄ solution in 482.5 seconds? (Molar mass

Given: How much current (in amperes) is required to deposit 0.159 g of copper from CuSO₄ solution in 482.5 seconds? (Molar mass of Cu = 63.5 g/mol, F = 96500 C/mol) Formula: Moles of Cu = 0.159/63.5 = 0.0025 mol. Substitution & Calculation: Reaction: Cu²⁺ + 2e⁻ → Cu(s), 2F deposits 63.5 g. . Charge = 0.0025 × 2 × 96500 = 482.5 C . Current = Q/t = 482.5/482.5 = 1 A . 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), Chapter: Electrochemistry (Latest NCERT 2026-27), Topic: Faraday's laws, charge required to reduce Al³⁺, 3F = 3 × 96500 C

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CHEMISTRY

What is the IUPAC name of the compound commonly known as chloroform?

Chloroform's IUPAC name is trichloromethane. 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

For a reaction with Δ H = 50 kJ/mol and Δ S = 0.1 kJ/K · mol, at what temperature does it become spontaneous?

Given: For a reaction with Δ H = 50 kJ/mol and Δ S = 0.1 kJ/K · mol, at what temperature does it become spontaneous? Formula: For spontaneity, Δ G = Δ H - TΔ S < 0. Substitution & Calculation: So, T > Δ H / Δ S = 50 / 0.1 = 500 K. 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.

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CHEMISTRY

In the reaction 2SO₂ + O₂ -> 2SO₃, how many grams of SO₃ are produced from 8 g of O₂ and excess SO₂? (Atomic masses: S =

Given: In the reaction 2SO₂ + O₂ -> 2SO₃, how many grams of SO₃ are produced from 8 g of O₂ and excess SO₂? (Atomic masses: S = 32, O = 16) Formula: Moles of O₂ = 8 / 32 = 0.25 mol. Substitution & Calculation: 1 mol O₂ produces 2 mol SO₃. Moles of SO₃ = 0.25 × 2 = 0.5 mol. Molar mass of SO₃ = 80 g/mol. Mass = 0.5 × 80 = 40 g. 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.

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CHEMISTRY

What is the mass percentage of a solution made by dissolving 30 g of sucrose in 120 g of water?

Given: What is the mass percentage of a solution made by dissolving 30 g of sucrose in 120 g of water? Formula: Total mass of solution = 30 g + 120 g = 150 g. Substitution & Calculation: Mass % = fracMass of sucroseTotal mass × 100 = 30/150 × 100 = 20% . 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.

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CHEMISTRY

How many sigma bonds are present in the C₂H₄ molecule?

C₂H₄ has a double bond (1 sigma, 1 pi) between carbons and 4 single bonds (4 sigma) to hydrogens. Total sigma bonds = 1 + 4 = 5. 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 electronic configuration of an element with 11 electrons?

Given: What is the electronic configuration of an element with 11 electrons? Formula: For 11 electrons (sodium): 1s² 2s² 2p⁶ 3s¹, following the order of filling based on increasing energy.. 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.

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CHEMISTRY

Which compound is formed as a major product when propene reacts with HBr in the absence of peroxides?

According to Markovnikov’s rule, the major product is 2-bromopropane. 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

The hormone that promotes sodium reabsorption in the kidneys is:

Aldosterone, a mineralocorticoid from the adrenal cortex, enhances sodium reabsorption in the distal tubules. 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 formal charge on the oxygen atom in the CO molecule?

In CO, oxygen has 1 triple bond (6 electrons) and 1 lone pair (2 electrons). Formal charge = 6 - 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

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