Which pair of substances will likely undergo single replacement reaction? A. Na and BaCl_(2) Is Zn and BaCl_(2) C. Ca and BaCl_(2) D. K and BaCl_(2)

## Step 1:A single replacement reaction occurs when one element replaces another element in a compound. This typically happens when a more reactive metal displaces a less reactive metal from its compound.## Step 2:To predict whether a single replacement reaction will occur, we can refer to the activity series of metals. The activity series is a list of metals arranged in order of decreasing reactivity.## Step 3:According to the activity series, a metal will only replace another metal in a compound if it is higher on the list (more reactive). Barium (Ba) is part of the compound in all the options.## Step 4:We need to compare the reactivity of Na, Zn, Ca, and K to that of Ba. The activity series from most reactive to least reactive for these metals is: K > Na > Ca > Zn > Ba.## Step 5:Since K is above Ba in the activity series, it is more reactive and thus can replace Ba in to form and . The other metals listed are less reactive than Ba and will not undergo a single replacement reaction with .