Which of the following metals or nonmetals
are expected to displace Mn or Cl (respec-
tively) from MnCl2?
1. Cu should displace Mn.
2. I should displace Cl.
3. Ca should displace Mn.
4. Br should displace Cl.
To determine which metals or nonmetals are expected to displace Mn or Cl from MnCl2, we need to compare their reactivity.
Manganese (Mn) is more reactive than copper (Cu), calcium (Ca), and bromine (Br). This means that copper, calcium, and bromine can displace manganese from MnCl2.
On the other hand, chlorine (Cl) is more reactive than iodine (I). This means that iodine can displace chlorine from MnCl2.
Therefore, from the given options:
1. Cu should displace Mn.
2. I should displace Cl.
To determine whether a metal or nonmetal can displace another element from a compound, we need to check their positions in the activity series for metals or in the halogen activity series for nonmetals.
For the first statement, Cu displacing Mn, we can refer to the activity series of metals. Copper (Cu) is located below manganese (Mn) in the series, which means that Cu is less reactive than Mn. Therefore, Cu cannot displace Mn from MnCl2. Consequently, statement 1 is false.
For the second statement, I displacing Cl, we need to refer to the halogen activity series. Iodine (I) is located above chlorine (Cl) in the series, meaning that I is more reactive than Cl. Hence, Iodine (I) can displace chlorine (Cl) from MnCl2. Hence, statement 2 is true.
For the third statement, Ca displacing Mn, we can once again refer to the activity series of metals. Calcium (Ca) is located below manganese (Mn) in the series, which means that Ca is less reactive than Mn. Therefore, Ca cannot displace Mn from MnCl2. Consequently, statement 3 is false.
For the fourth statement, Br displacing Cl, we need to refer to the halogen activity series. Bromine (Br) is located below chlorine (Cl) in the series, meaning that Br is less reactive than Cl. Therefore, Bromine (Br) cannot displace chlorine (Cl) from MnCl2. Thus, statement 4 is false.
So, only statement 2 is true, where iodine (I) can displace chlorine (Cl) from MnCl2.