A bedroom used to be referred to as a bedchamber, and perhaps Poe prefers the allusion to a vague type of chamber (i.e., torture chamber).
Demonstrative pronouns usually refer to objects rather than people.
"The boys were all sleeping together in the new bedroom." or "The boys all used to sleep together in the new bedroom." (The articles in an English translation have to be supplied by the translator since Latin doesn't express this distinction. These sentences could equally well have "Boys" rather than "The boys" and "a new bedroom" rather than "the new bedroom.")
NO - you would still refer to that person with use of the name
Allah and Muhammed are different, FYI.
Demonstrative pronouns typically refer to objects or things, such as "this," "that," "these," and "those," to point out or identify them. They do not generally refer to people or concepts.
I think this must refer to direct water heating rather than production of electricity
"Chew" can refer to the action of mechanically breaking down food with the teeth, or it can refer to a type of tobacco that is chewed rather than smoked.
There are several, of which endeca- and hendeca- are more common. However, most mathematicians who wish to communicate rather than be pretentious will refer to an 11-gon or 11-hedron rather than use the prefices.
No, it makes the bedroom more coulorfull.
Rather than type out a long list, I refer you to the NRC website, see below
No, it is more common to refer to Greek people as "Greeks" rather than "Grecians."
The antonym for "precognitions" is "retrodictions." Retrodictions refer to knowledge or predictions about past events rather than future events.