A furnace wall consists of 25 cm firebrick, 30 cm insulating brick and 25 cm building brick , respectively. The inside wall is a temperature of 800C and the atmospheric temperature is 15 degrees * C C. Calculate the heat loss per of wall area and the temperatures of the interfaces of the furnace. The heat transfer coefficient for the outside surface is 10 W/m^ ^ 2.k and the thermal conductivities of the firebrick , insulating brick, and building brick are 6, 0.3 and 0.8W / m respectively. m^ ^ 2; tc=^ * 1 point t 1 =800^ C; t a iota c; t 2 =15^ o; 86.363 degrees * C 73.148°C 74.059 degrees * C; 68.983 degrees * C

The correct answer is:  [B]:  "produces OH⁻ ions" .

   →  { This is the answer choice that goes in the portion in the circle labeled, "x" ;
 
      → within the "Venn Diagram given [in this very question/problem.]} .

Explanation:


Essentially, the question is asking:  


       "Which of the following answer choices are characteristics of "bases", ONLY ? " ; 

         →   {and NOT TRUE of "acids", only} ; AND:    

         →   {and NOT TRUE of BOTH:  "acids" ; AND: "bases"}? ; 

The answer choices, as posted, are:

   [A]:  conducts electric current ; 
   [B]:  produces OH⁻ ions .
   [C]:  tastes sour ; 
   [D]:  reacts with carbonates.

   →  The correct answer is:  [B]:  "produces OH⁻ ions" . 

   Note that "bases" (NOT  "acids") produce "hydroxide ions"                   {i.e. "OH⁻ " ions} when dissolved in water; whereas "acids" (NOT  "bases")  produce "hydrogen ions" {i.e. " H⁺ " ions} when dissolved in water.

Hence, this answer choice:  [B]:  "produces OH– ions" ;

                                                       →  is CORRECT.


Let us consider the other answer choices:

   [A]:  "conducts electric current" ; is INCORRECT.  This characteristic applies to BOTH:  "acids" (of various types) ; AND to "bases" (of various types) — and NOT strictly to "bases" . 

   [C]:  "tastes sour" ; is INCORRECT.  
        This characteristic applies to "acids"— AND NOT to "bases".  
Note that "acids" tend to taste "sour",  whereas as "bases" tend to taste "chalky". 

   [D]:  "reacts with carbonates" ; is INCORRECT.  
      Note that "acids" — NOT "bases" — react with carbonates ["carbonates" are "bases"] — to produce a salt and water— and release "CO₂ (g) " — that is, "carbon dioxide" (in gaseous form).

      →  The correct answer is:

      →  Answer choice:  [B]:  " produces OH⁻ ions " .

Hope this answer—and rudimentary [yet lengthy] — explanation is of help to you.
    Best wishes in your academic pursuits!