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526 public questions tagged with this topic.

Specific Heat Capacity and Latent Heat

Which of the following statements is incorrect about a cyclic process?

**Heat capacity** at constant pressure C_p and volume C_v, C_p = C_v + R per mole, for solids Dulong-Petit C_v≈3R≈25 J/mol·K. Specific heat and latent heat govern temperature changes and phase transitions, Q = m c ΔT for heating, Q = m L for melting/boiling at constant T. In a cyclic process, Δ U = 0 since U is a state function, and net heat equals net work. Option A is incorrect; internal energy does not change over a complete cycle. Using first law ΔU = Q - W, W = ∫ P dV, isobaric W = P ΔV, isothermal W = n R T

Ref: NCERT > Physics Book > Thermodynamics > Specific Heat Capacity and Latent Heat

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Specific Heat Capacity and Latent Heat

Which of the following is NOT a state variable in thermodynamics?

**Specific heat capacity** c = Q/(m ΔT) (J/kg·K), molar C = Q/(n ΔT), heat required to raise temperature, Q = m c ΔT, for water c=4186 J/kg·K, latent heat L = Q/m for phase change at constant temperature, fusion L_f and vaporization L_v, Q = m L, e.g., ice melting L_f=3.34×10⁵ J/kg, water vaporization 2.26×10⁶ J/kg. State variables depend only on the current state of the system, not the path taken to reach it. Pressure, volume, and temperature are state variables. Heat ( Δ Q ) is not a state variable; it is a mode of energy transfer dependent on the process. Using first law

Ref: NCERT > Physics Book > Thermodynamics > Specific Heat Capacity and Latent Heat

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CHEMISTRY

A compound has an empirical formula CHâ‚‚ and a molar mass of 70 g/mol. What is its molecular formula? (Atomic masses: C

Given: A compound has an empirical formula CH₂ and a molar mass of 70 g/mol. What is its molecular formula? (Atomic masses: C = 12, H = 1) These values define the system as per NCERT data. Formula: Empirical mass = 12 + (2 × 1) = 14 g/mol. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: n = 70 / 14 = 5. Molecular formula = C₅H₁₀. 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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ZOOLOGY

Which hormone is secreted by the parathyroid gland and increases blood calcium levels?

PTH increases blood calcium levels by stimulating calcium release from bones and increasing absorption in the intestines. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Zoology section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Zoology portion (Latest NCERT Textbooks for Academic Session 2026-27 - Rationalized Edition for Class XI and XII), Topic: Structural organization, physiology, human health and related concepts as per latest syllabus.

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ZOOLOGY

Which of the following animals belongs to class Amphibia?

Rana (frog) belongs to class Amphibia, characterized by its ability to live both on land and in water. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Zoology section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Zoology portion (Latest NCERT Textbooks for Academic Session 2026-27 - Rationalized Edition for Class XI and XII), Topic: Structural organization, physiology, human health and related concepts as per latest syllabus.

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BOTANY

Which of the following is NOT an adaptation of prey to avoid predators?

Increased reproduction rate helps populations survive but does not directly protect individual prey from predators. This follows from NCERT principle where relation explains outcome clearly for students.

Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Biology - Botany portion covering relevant concept, Topic: Plant structure, physiology and applications.

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CHEMISTRY

What is the product when CH₃CH₂NHCH₂CH₃ reacts with excess CH₃I followed by NaOH ?

N-Ethylethanamine with excess CH₃I forms a quaternary salt ( CH₃CH₂N(CH₃)2CH₂CH₃+I- ), which with NaOH yields CH₃CH₂N(CH₃)CH₂CH₃ via elimination. 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.

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CHEMISTRY

What is the product when CH₃CH₂NH₂ reacts with excess CH₃CH₂I followed by AgOH ?

Ethanamine with excess CH₃CH₂I forms a quaternary salt ( (CH₃CH₂)4N+I- ), which with AgOH yields (CH₃CH₂)3N via elimination of CH₃CH₂I . This follows from NCERT principle where relation explains outcome clearly for students.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Chemical Bonding and Molecular Structure, Topic: Covalent bonds in CH₃CH₂NH₂, counting bonds, Lewis structure.

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CHEMISTRY

Which of the following has the highest boiling point?

Boiling points increase with the size and molecular mass of halogen atoms in halogenated hydrocarbons. 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.

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