9.
2 answers:
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I'll try to explain this in the simplest way I've learned it.
What the last column basically meant was that if the second word of the compound has a negative ion charge
and contains oxygen it will give the the compound a name ending with -ate
Answer:
a)
b) NR
c) NR
d)
e) NR
Explanation:
a) Nickel is more reactive than copper so the first one will displace the other:
b) Due to the higher reactivity the magnesium has compared to the zinc, the first will remain in solution and the second will reamin solid. So, NR.
c) No reaction occurs, gold is resistant to acid in normal conditions due to its characteristic as noble metal.
d) Chromium is more reactive than cobalt so the last one will be displaced:
e) Nothing happens, the reduction potencial of the hydrogen gas bubbled ins't enough to reduce the silver.