When doing single replacement reactions for metals. If A is greater in reactivit

Question

When doing single replacement reactions for metals. If A is greater in reactivity then B there will be a reaction and if B is is greater than A then there is no reaction. Example Ca(s)+ZnSo4 because calcium is more reactive than Zinc then there is a reaction. When is nonmetals it's the same concept except it's A and C. Example: I2(s)+2NaCl (aq) there's no reaction because iodide is more reactive then chlorine. My questions is if I get an equation like NiSo4(aq)+Ca(s) where we have two metals would A be Nickle and B is Calcium meaning no reaction? Or should I flip the reactants to make Ca+NiSo4 where calcium being A is more reactive so reaction does happen? When doing single replacement reactions for metals. If A is greater in reactivity then B there will be a reaction and if B is is greater than A then there is no reaction. Example Ca(s)+ZnSo4 because calcium is more reactive than Zinc then there is a reaction. When is nonmetals it's the same concept except it's A and C. Example: I2(s)+2NaCl (aq) there's no reaction because iodide is more reactive then chlorine. My questions is if I get an equation like NiSo4(aq)+Ca(s) where we have two metals would A be Nickle and B is Calcium meaning no reaction? Or should I flip the reactants to make Ca+NiSo4 where calcium being A is more reactive so reaction does happen?

Explanation / Answer

it is easy to answer this type of question . we have standared reduction potential for all metal .

here we have to metals 1 ) Ca     2) Ni

Ca reuction potential = -2.87 V

Ni reduction potential = -0.26 V

higher neative potential element is more reactive than lower negative reduction potential element. it is applicable for all elements.

so here Ca is more reactive than Ni . Ca can replace Ni . but Ni cannot replace Ca

the possible reaction : Ca (s)   + NiSO4 (aq) ------------------> CaSO4 (aq) + Ni (s)

but

Ni(s)   + CaSO4 (aq) --------------------->no reaction

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