Gases tend to deviate from the ideal gas law at
a. high pressuresb. low pressuresc. high temperatured. low pressures and high temperatures

The Ideal Gas equation is:

Where:

is the pressure of the gas

the number of moles of gas

is the gas constant

is the absolute temperature of the gas in Kelvin.  

According to this law, molecules in gaseous state do not exert any force among them (attraction or repulsion) and the volume of these molecules is small, therefore negligible in comparison with the volume of the container that contains them.

Now, real gases can behave approximately to an ideal gas, under the conditions described above.

However, when temperature is low these gases deviate from the  ideal gas behavior, because the molecules move slowly, allowing the repulsion or attraction forces to take effect.

The same happens at high pressures, because the volume of molecules is no longer negligible.

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no. dot product   =0 when vecs at right angles