6 public questions tagged with this topic.
Given: Q = 16744J, Lf = 3.35×105J kg−1. Q = mLf⇒m = QLf = 167443.35×105≈0.05kg = 50g. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 50 g. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.
Ref: NCERT Class 11 Physics, Chapter 11: Thermal Properties – Calorimetry.
Given: m = 0.3kg, Lf = 3.33×105J kg−1. Q = mLf = 0.3×3.33×105 = 99900J = 99.9kJ. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 99.9 kJ. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.
Ref: NCERT Class 11 Physics, Chapter 11: Thermal Properties – Calorimetry.
The heat supplied during melting (latent heat of fusion) is used to change the state from solid to liquid, overcoming intermolecular forces, not to increase temperature (Section 10.8). As per NCERT, applying relevant law/formula with correct units and sign convention leads to Heat is used to change the state, not raise temperature. This satisfies dimensional consistency and physical conditions given, so option A is scientifically correct.
Ref: NCERT Class 11 Physics, Chapter 11: Thermal Properties – Calorimetry.
Δ Ssys = Δ Hfus / Tm = 6.01 × 10³ / 273 = 22.01 J/K, Δ Ssurr = -Δ H / T = -6.01 × 10³ / 263 = -22.85 J/K, Δ Stotal = 22.01 - 22.85 = -0.84 J/K.
Ref: NCERT Class 11 Chemistry > Chapter 5: Thermodynamics > Topic: Third Law of Thermodynamics and Applications
Moles of ice = 36 / 18 = 2 mol. Heat absorbed = 2 × 6.01 = 12.02 kJ.
Ref: NCERT Class 11 Chemistry > Chapter 5: Thermodynamics > Topic: Thermodynamic Terms - System Surroundings and Types of Systems
Increases correctly describes the effect or change asked about in this question. In Thermodynamics, understanding cause-and-effect relationships is essential for predicting biological outcomes. Increases occurs because of specific molecular interactions, thermodynamic principles, or regulatory mechanisms that govern this biological process. The other options (Decreases, Remains constant, and Depends on the surrounding temperature) describe either opposite effects, effects that occur under different conditions, or changes associated with unrelated processes.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 1
