Answer: As long as it is not known that the hands of the shopkeeper were Najis, the food is to be considered Tahir, and it is not necessary to investigate further.

Answer: It is not permissible since the food, as mentioned in the question, will be considered impure (Najis) because of coming into contact with the wet parts from the steam of the impure meat.

Answer: As long as you are not sure that it is ritually impure (najis), it is to be considered pure and you can use it, applying all the rules of purity to it without any hesitation or doubt. However, If it is proven to contain those [impure] elements, it should be considered impure, except if the occurrence of chemical change is proven. Such a change is not proven in manufacturing of soaps.

Answer: An organ extracted from the body is ritually impure (najis) irrespective of whether it came from a Muslim or a non-Muslim. And when it becomes, by rejuvenation, part of a Muslim’s body or of someone who is considered a Muslim, it becomes tãhir.

Answer: The fluid which a woman feels during foreplay or lustful thinking but it is not much to spread to other parts, is clean. Ghusl does not become obligatory in this case and it does not make wudhu void either but if there is much fluid and is called ejaculation and the fluid spreads to the underwear and this normally takes place during orgasm and full satisfaction, the fluid is najis (impure) and in this case ghusl becomes obligatory. In fact, if emission takes place without orgasm, the necessary precaution is that it is najis and it causes janabah.
Hence, if a woman enters the state of janabah intentionally with the details mentioned above, both Qadha and kaffara become obligatory on her. The obligatory precaution is that she should restrain from eating and drinking for the rest of the day.