Which vs. What

[asantamariat]

Hi

My question is about the use of "What" and "Which"

for example:

What is her phone number?
or
Which is her phone number?

What would be correct? and Why?
Is there any other case when the use of What or Which sounds awkward?

thanks

[billmcd]

Hi

My question is about the use of "What" and "Which"

for example:

What is her phone number? You want to know the number.
or
Which is her phone number? You are asking about the number among two or more possibilities.

What Which would be correct? and Why? See above.
Is there any other case when the use of What or Which sounds awkward?
What "sounds awkward"?

thanks

b.

[asantamariat]

Thank you