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Question

If pressure is applied to the equilibrium of solid $$\rightleftharpoons$$ liquid. The melting point of the solid :


A
will not change
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B
may increase or decrease depending upon the nature of solid
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C
will always increase
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D
will always decrease
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Solution

The correct option is B may increase or decrease depending upon the nature of solid

If pressure is applied to the equilibrium of solid $$\rightleftharpoons$$ liquid. The melting point of the solid may increase or decrease depending upon the nature of solid.

As, $$V\left(s\right) > V\left(l\right)$$ for ice-water and $$V\left(s\right) <V\left(l\right)$$ for others.

For most substances, increasing the pressure when a system is in equilibrium between liquid and solid phases will increase the phase transition temperature. Water is one of a few special substances for which the pressure lowers the temperature of transition. The basic reason is that water actually expands when it goes from the liquid to solid phase.


Chemistry

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