Question

multiple - choice question
which is a single replacement reaction?
2c₅h₅ + fe = fe(c₅h₅)₂
pb + feso₄ = pbso₄ + fe
2mgi + mn(so₃)₂ = 2mgso₃ + mni₄

Explanation:

A single - replacement reaction has the general form \(A + BC=AC + B\), where \(A\) and \(B\) are elements.

• For the reaction \(2C_{5}H_{5}+Fe = Fe(C_{5}H_{5})_{2}\), it is a combination reaction (two substances combine to form one product).
• For the reaction \(Pb+FeSO_{4}=PbSO_{4}+Fe\), \(Pb\) (an element) replaces \(Fe\) (an element) in \(FeSO_{4}\), which fits the form of a single - replacement reaction \(A + BC = AC + B\) (\(A = Pb\), \(B = Fe\), \(BC=FeSO_{4}\), \(AC = PbSO_{4}\)).
• For the reaction \(2MgI+Mn(SO_{3})_{2}=2MgSO_{3}+MnI_{4}\), it is a double - replacement reaction (the positive ions \(Mg^{+}\) and \(Mn^{4 +}\) exchange their negative ion partners \(I^{-}\) and \(SO_{3}^{2-}\)).

Answer:

\(Pb + FeSO_{4}=PbSO_{4}+Fe\) is a single - replacement reaction.