Can Intel® Core™2 Quad Processor Q9650 work on MS-7525 (BostonL)?

The chipset yes but the mobo manufacturer must provide the BIOS software.
You might need to check if you can find the latest BIOS.
If the latest BIOS version does not have Q6600 and Q6700 support, you still can not use those.
On the official page, HP does not include those 2.
You can try but nobody can tell you if it works.
 

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How to check if HP has provided support.? I mean from where to download BIOS? ON MSI site there is 5.31 Rev A BIOS