For water the critical temperature is 374 c, water at t- 400 c exist as vapor

The statement is False.

Explanation:

Critical temperature is defined as the temperature at and above which the liquid and the gaseous states are indistinguishable. This is the temperature at and above which the liquid cannot be liquefied.

Above critical temperature or pressure, the substance is in supercritical fluid (SCF) state. A supercritical fluid is the one in which liquid and gaseous state can not be distinguished. It can dissolve like liquids and can effuse like solids.

Water above its critical temperature exists in SCF state which is neither vapor nor liquid.

Thus, the statement is false.

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