Yes, the Windows 8 phone app store has many apps that you can download, but Google Play comes pre-installed on your phone.
Yes, Google Chrome comes inbuilt in Windows 8. It can be used freely without any hassle.
Yes, it is okay to download and install Google Chrome on a Windows 8 laptop. Google Chrome has stable, beta and dev versions available to be downloaded for Windows 8 users.
Yes, I play Minecraft on my Windows 8.
Google does not plan on ever officially supporting Windows 2000, due to it's age and not many users using it. The portable build of Google Chrome, Chromium, can be used on Windows 2000 without any major issues.
Go to Windows Store and search for it.
You can use the Google DNS to increase the BSNL broadband speed in Windows 8.
Yes, there is a windows 8 based Chrome. It is a very stable version and does not crash much often.
There are several apps for the Windows phone that aren't available at the Windows store for PCs, including certain games.
some games
some games
Google Earth can be downloaded on Windows 8 but more important question is whether it will run on Window 8. In most situations Google Earth will run on Windows 8 but there are some reports of users with problems running on Windows 8 so best to try to install GE and see if it works correctly or not. Note that Google has not officially listed Windows 8 as a supported platform for running Google Earth. If the normal download page fails to download Google Earth then try the direct download page (found in the related links below). Also at present Google Earth is a 32-bit application so it doesn't take advantage of the all the computers memory. 32-bit apps are limited to 2 GB of memory. A future release of Google Earth v7 will most likely be more stable on Window 8 at which time Google will officially announce Windows 8 is supported