Are table salt and sugar homogeneous?
No, its not a homogenous mixture as sugar and sugar are not distributed uniformly. However, sugar in water and salt in water is a homogenous mixture.
Table sugar and table salt are a pure substances unless the salt is labeled iodized salt. Iodized salt is regular table salt with tiny amounts of an iodine compound added such as potassium iodide or sodium iodide. The iodine is added because many people have an iodine deficit which can lead to thyroid problems.
It depends. Some table salt is pure, or nearly pure, sodium chloride. An increasing amount of table salt is being sold with iodine added to it, which makes this "iodized" salt not a pure substance. Table sugar is usually pure, or nearly pure, sucrose. It's usually pure enough to be considered a pure substance. Refined sugar and refined salt (without additives or impurities) are pure substances.