H4 to h1 two applications pending?

But if h1 gets approved first then it will be applicable only from 1st oct onward. So how will my h4 application cancel my h1 approval?

Answer:
Your H4 application will not be cancelled. Your h1 status in the country will be lost as your last approved application was for H4 status and that prevails over H1. So when you go out of the country, you will get a visa stamped using your h1b status and that is what you call revalidation.
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