Which of the following metals or nonmetals

are expected to displace Mn or Cl (respectively) from MnCl2?
1. Ca should displace Mn.
2. Br should displace Cl.
3. Cu should displace Mn.
4. I should displace Cl.

Na will replace Mn

You want to look up the activity series. Here is a link.

http://en.wikipedia.org/wiki/Reactivity_series

This is a two part question.
To determine part A, which metal (Ca or Cu) will displace Mn^2+ from solution? Here is the answer. Any metal ABOVE the Mn in the table will displace the Mn^2+. Ca is above so it will. Cu is below so it will not.

For part B, the oxidizing power of the halogens goes like this.
F>Cl>Br>I
So Br will not displace Cl(Cl will displace Br but not the other way).

I will not displace Cl (Cl will displace I but not the other way)

In order to determine which of the following metals or nonmetals can displace Mn or Cl from MnCl2, we need to compare their reactivity. The reactivity of metals can be determined by referring to the reactivity series of metals, while the reactivity of nonmetals can be determined by comparing their electronegativities.

1. Ca should displace Mn: According to the reactivity series of metals, calcium (Ca) is more reactive than manganese (Mn). Therefore, calcium can displace manganese from MnCl2.

2. Br should displace Cl: Bromine (Br) is more reactive than chlorine (Cl) based on electronegativity. Bromine has a higher electronegativity value, which indicates a greater tendency to gain electrons compared to chlorine. As a result, bromine can displace chlorine from MnCl2.

3. Cu should displace Mn: Copper (Cu) is less reactive than manganese (Mn). Therefore, copper cannot displace manganese from MnCl2.

4. I should displace Cl: Iodine (I) is more reactive than chlorine (Cl) based on electronegativity. Iodine has a lower electronegativity value, which indicates a greater tendency to lose electrons compared to chlorine. Hence, iodine can displace chlorine from MnCl2.

So, the correct options are 1. Ca should displace Mn and 4. I should displace Cl.

To determine whether a metal or nonmetal can displace another element, we need to consider their reactivity. In general, metals tend to donate electrons and are more reactive than nonmetals. Therefore, metals are capable of displacing other metals from their compounds.

In the given options, we have:
1. Ca: Calcium is a more reactive metal than manganese (Mn), so it can displace Mn from MnCl2. This statement is correct.
2. Br: Bromine is a nonmetal, and nonmetals are generally less reactive than metals. It cannot displace chlorine (Cl) from MnCl2. This statement is incorrect.
3. Cu: Copper is less reactive than manganese, so it cannot displace Mn from MnCl2. This statement is incorrect.
4. I: Iodine is a nonmetal, and as mentioned earlier, nonmetals are generally less reactive than metals. It cannot displace Cl from MnCl2. This statement is incorrect.

Thus, among the options provided, only option 1 is correct.