write the corresponding half reaction for (a) Ca(s) + Cu(NO3)2(aq) → Cu(s) + Ca(NO3)2(aq) (b) Zn(s) + Ni<sup>2+</sup> → Ni(s) + Zn<sup>2+</sup>

Md Ariful Islam

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Solution:

(a) Ca(s) + Cu(NO3)2(aq) → Cu(s) + Ca(NO3)2(aq)

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Ca(s) − 2e- → Ca2+(aq) (oxidation half-reaction)

Cu2+(aq) + 2e- → Cu(s) (reduction half-reaction)

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Ca(s) + Cu2+(aq) → Ca2+(aq) + Cu(s)

(b) Zn(s) + Ni2+ → Ni(s) + Zn2+

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Zn(s) − 2e- → Zn2+ (oxidation half-reaction)

Ni2+ + 2e- → Ni(s) (reduction half-reaction)

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Zn(s) + Ni2+ → Zn2+ + Ni(s)

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