Under what condition do non-ideal solutions show negative deviations?

Under what conditions non-ideal solutions show positive deviations?

The non ideal solution showing positive deviation :

Give one example each for non-ideal solution showing positive deviation and non-ideal solution showing negative deviation.

Give one example for non-ideal solution showing positive deviation and non-ideal solution showing negative deviation.

Non Ideal solution showing negative deviation is known as:

Non ideal solution showing positive deviation is known as: