Answer:
A Reaction
3. Pt(NO₃)₂(aq) + Cu(s)
4. Cr(s) + H₂SO₄(aq)
B Non Reaction
1. Mn(s) + Ca(NO₃)₂(aq)
2. KOH(aq) + Fe(s)
Y > Q > W > Z > X
Explanation:
The first task is determining if a reaction is set to take place according to the chemical equations outlined below.
1. Mn(s) + Ca(NO₃)₂(aq)
2. KOH(aq) + Fe(s)
3. Pt(NO₃)₂(aq) + Cu(s)
4. Cr(s) + H₂SO₄(aq)
Reactivity differs among elements; thus, they can be ordered by their reactivity levels.
1. Mn(s) + Ca(NO₃)₂(aq)
This reaction will not happen as Mn cannot replace Ca in its compound. A more reactive element typically displaces a less reactive one.
2. KOH(aq) + Fe(s)
The reaction is non-existent because Iron is less reactive compared to potassium, thus cannot replace it.
3. Pt(NO₃)₂(aq) + Cu(s)
Copper's reactivity exceeds that of platinum, allowing it to easily displace platinum. Therefore, this reaction will certainly occur.
4. Cr(s) + H₂SO₄(aq)
Chromium's position in the reactivity series is higher than that of hydrogen, enabling it to displace hydrogen in this compound. Consequently, this reaction will take place.
Based on the reactions
Q + W + Reaction occurs
Since a reaction occurs, element Q is more reactive, successfully displacing element W from the compound.
X + Z + No reaction
No reaction takes place since element X is less reactive than Z, and thus cannot displace Z.
W + Z + Reaction occurs
Here, element W is more reactive than Z, enabling it to displace Z from the compound.
Q + Y + Reaction occurs
In this instance, element Y is more reactive than Q, successfully displacing Q from its compound.
This results in the overall reactivity ranking as Y > Q > W > Z > X
