Answer:Here are the answers: 1. Filtration: The insoluble substance from a liquid mixture was separated by a liquid passing through the holes in filter paper, leaving the solid particles behind. This is the filtration method.2. Evaporation: A method of separating excess liquid from a mixture by heating is evaporation.3. The question is incomplete, as it doesn't list the mixtures. To answer, a list of mixtures would be needed. Decantation works best for separating mixtures where a solid has settled to the bottom of a liquid.4. Sieving: To separate rocks into different sized particles, sieving is the applicable technique.5. The question is incomplete. A list of techniques is needed to identify which is not a separation technique.6. The statement is incomplete and unclear. A complete statement about separating mixtures through a sieve is needed. Sieving separates mixtures based on particle size.7. Evaporation: The process by which water is separated by heating is evaporation.8. The question is too vague. The best technique for separating a mixture depends entirely on the nature of the mixture (e.g., solids, liquids, dissolved substances). More information is needed.