What is the exposition found in Jane Austen's Pride and Prejudice?

The exposition of a plot is
the moment when the characters and the situation are
introduced. It's also the moment when all
background information is given about the characters. More
specifically, the details are given through the author's
discussion rather than through the narration of the story. Jane Austen
actually mingles exposition with story narration. Her expositions can be found in
Chapters 1 through 5, but they are small paragraphs either
preceded by or followed by story narration.

For example, Austen opens
her first chapter with the narrator's witticism, but then
continues to use dialogue between Mr. and Mrs. Bennet to characterize both characters
and to introduce the situation as well. The dialogue, though it serves as
characterization, is actually not exposition. However, the very last
paragraph of this chapter is. Here, Austen uses the narrator to describe
Mr. Bennet's character as being an "odd mixture of quick parts, sarcastic humour,
reserve, and caprice" (Ch. 1). Austen also uses narration to describe Mrs. Bennet's
stupidity, temper, and nervousness.

The second chapter returns to be a
narration of the story rather than exposition. However, we return to
paragraphs of exposition in the third
chapter, which relays the Meryton ball. Here, Austen uses paragraphs of
exposition to describe Mr. Bingley's character, his sisters, and also the character of
Mr. Darcy. We learn that Mr. Bingley is lively and friendly, while Mr. Darcy is
standoffish. In addition, we learn that while Darcy was much admired when he first
entered the room, he was soon "discovered to be proud, to be above his company, and
above being pleased" (Ch. 3). We also learn background details such as how much money
they earn and where Mr. Darcy's estate is.   

Other paragraphs of
exposition can be found in the fourth and fifth chapters as
well.