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CHEMISTRY

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45 questions

CHEMISTRY

In the reaction CSâ‚‚ + 3Oâ‚‚ -> COâ‚‚ + 2SOâ‚‚, how many grams of SOâ‚‚ are produced from 19 g of CSâ‚‚? (Atomic masses

Given: In the reaction CS₂ + 3O₂ -> CO₂ + 2SO₂, how many grams of SO₂ are produced from 19 g of CS₂? (Atomic masses: C = 12, S = 32, O = 16) These values define the system as per NCERT data. Formula: Molar mass of CS₂ = 12 + (2 × 32) = 76 g/mol. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Moles of CS₂ = 19 / 76 = 0.25 mol. 1 mol CS₂ produces 2 mol SO₂. Moles of SO₂ = 0.25 × 2 = 0.5 mol. Mass = 0.5 × 64 = 32 g. 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: Some Basic Concepts, Structure of Atom and Periodicity, Topic: Mole concept, atomic models and periodic trends.

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CHEMISTRY

Calculate the kinetic energy of an electron ejected from a metal with nu_0 = 5.0 × __10POW₁₄__Hz by light of nu = 7

Given: Calculate the kinetic energy of an electron ejected from a metal with nu_0 = 5.0 × __10POW₁₄__Hz by light of nu = 7.0 × __10POW₁₄__Hz. (h = 6.626 × 10⁻³⁴ J s) These values define the system as per NCERT data. Formula: Kinetic energy = h(nu - nu_0) = 6.626 × 10⁻³⁴ × (7.0 × __10POW₁₄__- 5.0 × __10POW₁₄__) = 6.626 × 10⁻³⁴ × 2.0 × __10POW₁₄__= 1.325 × 10⁻¹⁹ J.. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Substituting values like 1.2 × 10⁻⁵, 236 J kg⁻¹ K⁻¹, CH₃CH₂NH₂ 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 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

Which compound involves ionic bonding between a group 1 element and a group 16 element?

Given: Which compound involves ionic bonding between a group 1 element and a group 16 element? These values define the system as per NCERT data. Formula: Na₂O forms by electron transfer from sodium (group 1) to oxygen (group 16), creating Na^+ and O²- .. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Substituting values like 1.2 × 10⁻⁵, 236 J kg⁻¹ K⁻¹, CH₃CH₂NH₂ 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 kg⁻¹ K⁻¹, m/s², 10⁻⁵ 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.

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CHEMISTRY

Calculate the mole fraction of ethanol ( Câ‚‚Hâ‚…OH ) in a solution containing 69 g of ethanol and 198 g of water. (Mola

Given: Calculate the mole fraction of ethanol ( C₂H₅OH ) in a solution containing 69 g of ethanol and 198 g of water. (Molar mass: C₂H₅OH = 46 g/mol, H₂O = 18 g/mol ) These values define the system as per NCERT data. Formula: Moles of ethanol = 69/46 = 1.5 mol. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Moles of water = 198/18 = 11 mol . Total moles = 1.5 + 11 = 12.5. Mole fraction of ethanol = 1.5/12.5 = 0.12 . 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: Some Basic Concepts, Structure of Atom and Periodicity, Topic: Mole concept, atomic models and periodic trends.

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CHEMISTRY

What happens when phenol is treated with dilute nitric acid?

Phenol reacts with dilute HNO ₃ to form a mixture of o-nitrophenol and p-nitrophenol. 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

How many geometrical isomers are possible for [Cr(NH₃)2Cl₄]^{- ?

For octahedral [Ma₂b4], 2 geometrical isomers exist: cis (two NH₃ adjacent) and trans (opposite). 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 method is used to detect sulphur in an organic compound by forming a violet-colored complex?

In Lassaigne’s test, sulphur forms Na₂S, which reacts with sodium nitroprusside to produce a violet-colored complex, Na₄[Fe(CN)5NOS] . 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: Organic Chemistry - Basic Principles, Hydrocarbons and Reaction Mechanisms, Topic: Nomenclature, isomerism and reaction types.

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CHEMISTRY

Which of the following oxides is most acidic?

Across a period, oxide acidity increases. Cl₂O₇ (from Group 17) is highly acidic, forming a strong acid with water. 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

The K_{sp of PbF₂ is 3.3 × 10⁻⁸. What is its solubility in 0.01 M NaF ?

Given: The K_{sp of PbF₂ is 3.3 × 10⁻⁸. What is its solubility in 0.01 M NaF ? These values define the system as per NCERT data. Formula: K_{sp = [Pb²+][F-]², [F-] = 0.01, 3.3 × 10⁻⁸= S · (0.01)². This is the standard NCERT relation for this phenomenon. Substitution & Calculation: S = 3.3 × 10⁻⁸/ 0.0001 = 3.3 × 10⁻⁴ M. 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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