Risk free rate for wacc

Hello,

In order to get Market Premium under CAPM formulae, Return on equity market assumed is CNX nifty 500 return.

Is it correct as it represents a broad diversified market return?

The Risk free rate assumed must be 10 year Government of India Bond Yield?

On the nse website from where can we get the yield rate history and which security type to select?

please advise.