2K + 2H2O = 2KOH + H2
Zn + H2O = ZnO + H2
Zn + 2HCl = ZnCl2 + H2
3Zn + 2CrCl3 =3ZnCl2 + 2Cr
2Cu + O2 = 2CuO
Cu + Hg(NO3)2= Cu(NO3)2 + Hg
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Verified answer
2K + 2H2O = 2KOH + H2
Zn + H2O = ZnO + H2
Zn + 2HCl = ZnCl2 + H2
3Zn + 2CrCl3 =3ZnCl2 + 2Cr
2Cu + O2 = 2CuO
Cu + Hg(NO3)2= Cu(NO3)2 + Hg