Q8

Q 8
Reaction is non spontaneous (mentioned in para)and if beta is equal to 0.7 and you plug in this value in expression calculated in Q 7 then this will result in K>1 which makes the process spontaneous.

But maam how do we know if bets is 0.7 or not. How do we calculate it?

They calculated beta value as 0.7 which  you need to prove that it is wrong.
Plug in expression calculated in Q7

We get to know reaction is non spontaneous from +ve delta G???

And how to check D part??

Delta G is positive as mentioned in paragraph
so Kc<1 is correct  ...this means reaction is non spontaneous.