A solid metallic block weighing 5 kg has an initial temperature of 500C. 40 kg of water initially at 25C 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. 0
B. -1.87
C. 1.26
D. 3.91
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