I have set new Apple ID but when I’m updating my apps password of old I’d is asking

Yes, purchases are forever tied to the AppleID used when making the purchase. They cannot be transferred to another AppleID. You will need to use the old AppleID to update those apps. Or, delete them and purchase them again with the new AppleID.

You can also only change the AppleID you use with the App Store once every 90 days.

pawan217 Said:

"I have set new Apple ID but when I’m updating my apps password of old I’d is asking I have set new Apple ID but still old I’d password is asking"

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Perform this Manually:

Though the same person (you!), perform as instructed here: What to do Before you Sell, Give Away, or Trade in your iPhone, iPad, or iPod touch - Apple Support. Things will be backed up, and you will be taken to a login screen.