Yes it can.
Let's say substance A is the substance and substance B is the impurity. The boiling point of the mixture would be somewhere between that of A and B, depending on the amount of impurities in the mixture.
Impurities will usually lower the melting point of an organic compound. Impurities also increase the range of melting points in the compound. This means the temperature needed for melting isn't consistent.
by pressurizing it.
The boiling point increases, thus the water would stop boiling, unless more energy is suppled than before.
The boiling point will increase. The impurities essentially "block" the molecules of the substance from leaving the liquid as a gas, so a higher temp is needed to boil it. see colligative properties.
Impurities dissolved in a liquid will increase the boiling point because they form chemical bonds with the solvent in which they are dissolved, which have to be broken by the addition of heat energy before the liquid can boil. In other words, they are like cement, holding the material together in liquid form.
If the impurity has a higher boiling point then the boiling point of the mixture will also be slightly higher, and vice versa.
A non volatile impurity does not have a tendency to form a vapor at the temperature of the substance it is mixed with. For example, adding salt to boiling water does not form a vapor of any sort.
on adding non-voatile substance there in an increase in bp of substance...for instance water with a non-volatile solute will h boiling point greater than 373K
A soluble volatile substance will lower the boiling point of a solution. The volatile substance will boil at a lower temperature than the water component, thus causing the solution to boil at a lower temperature.
Let's say substance A is the substance and substance B is the impurity. The boiling point of the mixture would be somewhere between that of A and B, depending on the amount of impurities in the mixture.
The presence of a non-volatile solute in a solution increases its boiling point. The amount of the elevation of the boiling point depends only on the number of molecules of solute present, and not on their identity. See the article entitled "Boiling-point elevation" on Wikipedia for the maths involved.
Adding sugar to boiling water it will increase the boiling temperature very slightly
Add impurities (salt and others) to the substance.
The boiling point of a liquid is the temperature at which the vapor pressure of the liquid equals the atmospheric pressure, or the pressure above the liquid. So, to increase the boiling point without adding a solute, one can increase the pressure above the liquid.
If the food coloring is water-based, it would be slightly above or below the boiling point of water (100 degrees Celsius) depending on the effect of the coloring substance on the water's boiling properties. Some colorings might be oil based, in which case their boiling point would be closer to 150-200 degrees Celsius.
The higher the boiling point, the less volatile. And vice versa.