If we increase the temperature of the tank to 85C, what will the new pressure be inside the tank?

The new pressure will increase.

Explanation:

If the temperature in a tank increases, the pressure inside the tank will also increase. This is one of the postulates of the general gas law.

Pressure exerted by a gas is it's force per unit area.

  "at constant volume, the pressure of a given mass or mole of gas varies directly with the absolute temperature" .

    The higher the pressure, the higher the temperature will be.

Since the complete parameters are not given, use this expression below:

where P and T are pressure and temperature

           1 and 2 represents initial and final states.

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