Question

The melting point of most of the solid substances increases with an increase in pressure. However ice melts at a temperature lower than its usual melting points when pressure is increased. This is because:

• A. the density of ice is lesser than $H_{2}O$
• B. pressure generates heats
• C. the chemical bonds break under pressure
• D. ice is not a true solid

Answer 1

The correct option is A the density of ice is lesser than $H_{2}O$

This can be explained with the help of Le Chatelier's principle.
As the density of ice is lesser and has more volume than water while applying pressure the volume decreases due to which its equilibrium is subjected to change and to counteract the effect of the change, it converts into liquid (water).