+0
Are the following sentences acceptable?

1. What's it?

2. That's it.

Thanks a lot for your reply.
+0
I agree with Goldmund -- "What's it?" by itself is not used. However, you can use "what's it...." if something follows, such as "What's its about? What's it for? What's it doing?"
+0
This question is double-posted.

See contraction
Teachers: We supply a list of EFL job vacancies
Comments  
Dear sir,

«What's it?» is not an acceptable sentence. But you may say «What is it?»

«That's it.» is an acceptable sentence.

Kind regards, Emotion: smile

Goldmund
 khoff's reply was promoted to an answer.
 davkett's reply was promoted to an answer.
Students: We have free audio pronunciation exercises.

Version:1.0 StartHTML:000000379 EndHTML:000238036 StartFragment:000237614 EndFragment:000237902 StartSelection:000237614 EndSelection:000237902 SourceURL:https://www.google.com.tw/search?q=%22what%27s+it%3F%22+%22that%27s+it%22&sxsrf=ACYBGNQ-02m7o9G4o... it?" "that's it" - Google Search

Noticing a smile brimming on his mother's face, DeWayne looks puzzled as he asks, “That's it? That's it? What's it?” “Elementary, my dear Watson,” says Lillie as she prepares to enjoy this moment of teaching DeWayne a new lesson.

Version:1.0 StartHTML:000000379 EndHTML:000238052 StartFragment:000237614 EndFragment:000237918 StartSelection:000237614 EndSelection:000237918 SourceURL:https://www.google.com.tw/search?q=%22what%27s+it%3F%22+%22that%27s+it%22&sxsrf=ACYBGNQ-02m7o9G4o... it?" "that's it" - Google Search

... what you meant by SORT 0 ”said Graldo twisting his mouth, as if trying to work out what this vision was telling them. “Can you describe this staff?” asked Graldo. Twinkle described it. “That's it” exclaimed Graldo “What's it?” gestured Twinkle.