Physics
For an ideal gas, which one of the following statements does not hold true?

The potential energy of the gas molecules is zero
The kinetic energies of all gas molecules are not same
There is no interactive force between the molecules.
The speed of all gas molecules is same

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Physics
Conservation of energy refers to the fact that

The entropy of the universe is always increasing
If you conserve energy you will not be as tired
No chemical reaction is 100 percent efficient
Energy cannot be created or destroyed but can be converted from one form to another

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