What is a standard state of a substance ? - Vidyadip

Question

What is a standard state of a substance ?

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Answer

The standard state of a substance is that state in which the substance has unit activity or concentration at $25^{\circ} C$. i.e., For solution having concentration 1 molar, gas at $1 atm$, pure liquids or solids are said to be in their standard states.

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