Misc: What is the compound NaCl commonly known as??

Questions

Many sailors used to wear ____ earrings so that they could afford a proper burial when they died?

Some very Orthodox Jew refuse to speak Hebrew, believing it to be a language reserved only for the?

A South African monkey was once awarded a medal and promoted to the rank of _______ during World War I?

Because they had no proper rubbish disposal system, the streets of ancient ___________ became literally knee-deep in rubbish?

The _______, Seventh-century native Mexicans, went into battle with wooden swords so as not to kill their enemies?