Will windows 11 support all 7th gen CPUs

mohith1402 "... my laptop is in the dell list which you provided ..." 

Yup, I missed it, although the fact that Dell is testing the computer doesn't mean that the computer will make the Windows 11 cut:

"This article designates Dell laptops and desktops that will be tested for upgrade to Windows 11 once that operating system releases. If your device is not listed below, Dell is not testing the device and drivers will not be upgraded for that model."

I'm not sure what Dell means by "will be tested for upgrade to Windows 11 once that operating system releases".  The Dell article was released July 21, at a point where Microsoft was saying the 7th Gen processors were being tested as part of the Insider program, and Microsoft's testing process looks like it has come to an end -- See "Update on Windows 11 minimum system requirements and the PC Health Check app" (released August 27), which says this:

"In June, we heard your questions about how we set the Windows 11 minimum system requirements and shared more information on the established principles that guided us in setting them. And as a team, we committed to exploring through Windows Insider testing and with OEMs whether there were devices running on Intel 7th Generation and AMD Zen 1 processors that met our principles."

"Following the results of our testing, we are making a small number of additions to the compatible processor list (explained further below), but otherwise will maintain the minimum system requirements as originally set. We have concluded that the compatible 64-bit processors selected, 4GB of memory, 64GB of storage, UEFI secure boot, graphics requirements and TPM 2.0 are the right minimum system requirements to deliver on the principles we established to best support you."

It all depends on Microsoft's future decisions about 7th Gen processors, I guess.  Based on the linked article from Microsoft, though, I doubt that the situation will change before October 5.