Which of the following reactions is/are redox reactions? You may select more tha

ID: 929257 • Letter: W

Question

Which of the following reactions is/are redox reactions? You may select more than one reaction.

HCl(aq) + NaOH(aq) = H2O(l) + NaCl(aq)

NiCl2(aq) + K2S(aq) = 2KCl(aq) + NiS(s)

C2H2(g) + H2(g) = C2H4(g)

2AgNO3(aq) + Cu(s) = 2Ag(s) + Cu(NO3)2(aq)

C(s, graphite) = C(s, diamond)

Na(s) + H2O(l) = NaOH(aq) + 1/2H2(g)

HCl(aq) + NaOH(aq) = H2O(l) + NaCl(aq)

NiCl2(aq) + K2S(aq) = 2KCl(aq) + NiS(s)

C2H2(g) + H2(g) = C2H4(g)

2AgNO3(aq) + Cu(s) = 2Ag(s) + Cu(NO3)2(aq)

C(s, graphite) = C(s, diamond)

Na(s) + H2O(l) = NaOH(aq) + 1/2H2(g)

1. C2H2 + H2 -----> C2H4

since if we look into oxidation state of carbon decreases from -1 to -2 (reduction) and hydrogen increases from 0 to +1

2. 2AgNO3 + Cu ----> 2Ag + Cu(NO3)2

oxidation number of Ag changes from +1 to 0 (reduction) and Cu increases from 0 to +2 oxidation

3.Na + H2O ------> NaOH + 1/2 H2

oxidation number of Na changes from 0 to +1 (oxidation) and Hydrogen decreases from +1 to 0 (reduction)

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