Respuesta :
Answer: 1. Option (b) is the correct answer.
       2. Option (b) is the correct answer.
Explanation:
1. The reaction between the given reactants will be as follows.
(a) [tex]Fe(OH)_{3} + CuO \rightarrow Fe_{2}O_{3} + Cu(OH)_{2}[/tex]
(b) [tex]Cu(OH)_{2} + H_{2}S \rightarrow CuS + H_{2}O[/tex]
(c) [tex]MgO + Ca(OH)_{2} \rightarrow Mg(OH)_{2} + CaO[/tex]
(d) [tex]SO_{3} + H_{2}O \rightarrow H_{2}SO_{4}[/tex]
Thus, out of the given options, the reaction [tex]Cu(OH)_{2} + H_{2}S \rightarrow CuS + H_{2}O[/tex] results in the formation of water.
2. Â Base on reactivity series, the reactivity of some metals in the decreasing order is as follows.
         K, Na, Ca, Mg, Al, Zn, Fe
Whereas B is a metalloid so, it will have properties of both metals and non-metals. Thus, boron (B) will also be less reactive than Al.
Therefore, out of the given options, Ca is more reactive than Zn and Fe.
