Do demonstrative pronouns ask questions

No, interrogative pronouns ask questions.

The interrogative pronouns are: who, whom, what, which, whose.

EXAMPLES

Who is the new chemistry teacher?

To whom do I give my completed application?

What is the score?

Which one do you prefer?

Whose car is blocking the drive?

The demonstrative pronounstake the place of a noun, indicating near or far in place or time.

They are: this, that, these, those.

EXAMPLES

This is the one I want.

That is mom's favorite.

These are for the bake sale.

You can have some of those.

Note: The interrogative pronouns also function as relative pronouns that introduce a relative clause; and the demonstrative pronouns function as adjectives when placed before a noun (That song is mom's favorite.)