Chemistry Equilibrium ETEA 2019
PMDC Verified Question 82 of 102
Ice and water is in equilibrium with each other. By increasing the pressure the equilibrium will shift in
A
Forward
B
Reverse
C
To all system at equilibrium
D
None of the above
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Forward
Concept:

Water has the unique property where its solid phase (ice) is less dense (occupies more volume) than its liquid phase.

Formula:

$$ \text{Ice}_{(s, \text{higher vol})} \rightleftharpoons \text{Water}_{(l, \text{lower vol})} $$

Solution:

  • According to Le Chatelier's Principle, increasing pressure on a system shifts the equilibrium towards the state that occupies less volume.


  • Since liquid water occupies about 9% less space than solid ice, increasing pressure forces the ice to melt.


  • This represents a shift to the right, which is the forward direction.


Why other options are incorrect:

Shifting in reverse would form more ice, which occupies more volume and would further increase the stress of pressure.

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