Rohan added different substances P, Q and R to three beakers each containing 30 mL of water as shown in the figure.

He observed that the temperature of beakers I and II increases while that of beaker III decreases. Substances P, Q and R could be respectively

Options

A. `NH_4 NO_3 , KOH and Na_2 CO_3 H_2 O`
B. `NH_3 Cl , CuSO_4 and NaCl`
C. `Na_2 SO_4 , CaO , CuSO_4 , 5H_2 O`
D. `NaNO_3 , KCl, K_2 SO_4`

Answer

C