1

Some native speakers use what and some which in the following examples:

  1. Which/what color is this?
  2. Which/what is your favourite book?(without giving any options)
  3. In which/what school do you study?

In my opinion, which is used when we give options to the listener. Isn't it?

0

Yes, which generally indicates a selection from separate options. They may be given or implied, perhaps by context. In many cases whee the options are separate, but very many options exist, the two have more or less identical meanings. Consider:

Which author do you like best?

If there is no context to narrow the possible choices, then the options are "eveery author the person addressed knows of" and the meaning is the same as

What author do you like best?

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