A solid metallic block weighing 5 kg has an initial temperature of 500 C. 40 kg of water initially at 25 C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. Specific heat of block material is 0.4 kJ.kg-1. K-1. Ignoring the effect of expansion and contraction and also the heat capacity to tank, the total entropy change in kJ.kg-1 , K-1 is

A solid metallic block weighing 5 kg has an initial temperature of 500

1.	A solid metallic block weighing 5 kg has an initial temperature of 500 C. 40 kg of water initially at 25 C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. Specific heat of block material is 0.4 kJ.kg-1. K-1. Ignoring the effect of expansion and contraction and also the heat capacity to tank, the total entropy change in kJ.kg-1 , K-1 is
A.	-1.87
B.	0
C.	1.26
D.	3.91
Answer» C. 1.26