Does the Pixel 3 need an active or passive USB C to 3.5mm Adapter? Does the Google Pixel 3 Phone require an active or passive USB C to 3.5mm jack adapter?
Google store doesn't sell this adapter in India but links to retailers whose product description shows it has a DAC chip and therefore  is active similar to this. Note that this works on Pixel 2 and Google Support for Pixel 2 clearly mentions it has a DAC and  is active.