(i) in 0 - 100 K C increase, so R increases but not linearly
(ii) ΔQ = mCΔT as C is more in (400 K - 500 K) then (0 - 100 K) so heat is increasing
(iii) C remains constant so there no change in R from (400 K - 500 K)
(iv) C is increases so R increases in range(200 K - 300K)