Question

The reaction below demonstrates which characteristic of a base?

Answer 1

In the reaction of the type: 
           CuSO4(aq)   +   2NaOH(aq)  ->   Cu(OH)2(s)   +   Na2SO4

Herein, base (NaOH) reacts with water soluble metal salt (CuSO4) to form metal hydroxide.

This displays ability of a base to react with a soluble metal salt. Hence correct answer is option D. 

Answer 2

I think the correct answer from the choices listed above is the last option. The reaction below demonstrates a characteristic of base which is the ability of a base to react with a soluble metal salt. Hope this answers the question. Have a nice day.