"I hear American siniging the varied carols I hear"

Is this a) onomatopea
b) anaphora
c)Aliteration
d)Antithesis
E) Personification

I think it is personification because Americaa is not a person therefore it can't sing?

If you mean "I hear America singing...", then yes, it's personification.

What is the irony is this passage?

In that direction, my windows commanded an unobstructed view of a lofty brick wall, black by age and everlasting shade; which wall required no spy-glass to bring out its lurking beauties, but, for the benefit of all near-sighted spectators, was pushed up to within ten feet of my window panes.
I know that irony means opposite but I am not sure where the irony is.
Is it the wall is black but there is lurking beauties?

You are correct in thinking that it is personification. "I hear America singing the varied carols I hear" is a line from the poem "I Hear America Singing" by Walt Whitman. In this line, America is personified as if it were a person capable of singing. Personification is a literary device where non-human things or abstract ideas are given human qualities or characteristics. In this case, America, a nation, is being portrayed as actively singing carols, which is a human-specific activity.