What would be the best technique to separate a mixture of pigments in a sample of ink?

distillation
chromatography
filtration
evaporation

chromatography

Explanation: Distillation is a purifying technique for two miscible liquids whose boiling points differ by more than 10 degree Celsius.

Chromatography is a purifying technique used for components in a mixture. It is based on the difference in the relative affinities of components towards mobile and stationary phase. To perform ink chromatography, a small dot of ink is put on a strip of filter paper. This end of the paper  strip is placed in a solvent called as mobile phase.The solvent moves up the paper strip  as it travels upward, it dissolves the components of ink and  make the components of ink move with it.The components that dissolve best in the  solvent will move at a faster rate than the ones which don't dissolve in solvent and thus can be separated.

Filtration is a purifying technique used for separating a mixture of solid and liquid using a filter paper which does not let the solutes pass and thus can be separated.

Evaporation is a purifying technique used for separating a mixture of non volatile solid and liquid in which liquids vaporizes to gaseous form and the solid remains.

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.