Does the word it's have one syllable or does it have 2?

Answer 1

It's is one syllable.

More

Be very careful not to confuse "it's" with "its"

• "It's" (with an apostrophe) means "it is": It's raining. I think it's a good plan.
• "Its" (without an apostrophe) is the possessive form of the word "it": The car lost its wheel. My dog ate its dinner.

Many people assume that because "it's" has an apostrophe it must be a possessive, but English pronouns are an exception to that rule. It's (it is!) the reason we write "hers" and "yours" instead of "her's" or "your's", and the pronoun "it" follows the same pattern.