Question

The melting points of most of the solid substances increase with an increase of pressure acting on them. However, ice melts at a temperature lower than its usual melting point when the pressure is increased. This is because: (a) ice is less dense than water (b) it generates heat (c) chemical bonds break. under pressure (d) none of the above

Name: Problem 69, Chapter 5: Inorganic Chemistry for Jee mains and Advanced
Uploaded: 2021-08-10T09:50:45-08:00
Duration: 1 min 2 s
Channel: Narayan Hari
Description: The melting points of most of the solid substances increase with an increase of pressure acting on them. However, ice melts at a temperature lower than its usual melting point when the pressure is increased. This is because: (a) ice is less dense than water (b) it generates heat (c) chemical bonds break. under pressure (d) none of the above

   The melting points of most of the solid substances increase with an increase of pressure acting on them. However, ice melts at a temperature lower than its usual melting point when the pressure is increased. This is because:
(a) ice is less dense than water
(b) it generates heat
(c) chemical bonds break. under pressure
(d) none of the above

Inorganic Chemistry for Jee mains and Advanced

Dr OP Tandon 2000 Edition

Chapter 5, Problem 69

Instant Answer

Solved by Expert Narayan Hari

08/10/2021

Step 1

This is due to the fact that an increase in pressure forces the molecules of the substance closer together, which increases the intermolecular forces and thus requires more energy (or a higher temperature) to overcome these forces and melt the substance. Show more…

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The melting points of most of the solid substances increase with an increase of pressure acting on them. However, ice melts at a temperature lower than its usual melting point when the pressure is increased. This is because: (a) ice is less dense than water (b) it generates heat (c) chemical bonds break. under pressure (d) none of the above

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Key Concepts

Clausius-Clapeyron Relation

This thermodynamic concept explains how the melting point of a substance changes with pressure. It relates the rate of change of the melting temperature with pressure to the latent heat and the volume change during the phase transition. In most substances, an increase in pressure raises the melting point, but if the volume decreases upon melting, as in the case of water, the melting point can lower with increased pressure.

Density Anomaly

This refers to the unusual property of a substance whose solid phase is less dense than its liquid phase. Water is a classic example; ice has a lower density than liquid water due to its open crystalline structure. Consequently, under increased pressure, the system favors converting the less dense ice to denser water, leading to a decrease in the melting point.

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