In which reaction does the oxidation number of hydrogen change?

a. hcl (aq) + naoh (aq) → nacl (aq) + h2o (l)

b. 2na (s) + 2h2o (l) → 2naoh (aq) + h2 (g)

c. cao (s) + h2o (l) → ca (oh) 2 (s)

d. 2hclo4 (aq) + caco3 (s) → ca (clo4) 2 (aq) + h2o (l) + co2 (g)

e. so2 (g) + h2o (l) → h2so3 (aq) ?

Question

13 July, 10:47

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Clinton · Answer 1

It changes in

b. 2na (s) + 2h2o (l) → 2naoh (aq) + h2 (g)

H2 has oxidation number of 0 but 2H2O implies H has oxidication number of 4

In which reaction does the oxidation number of hydrogen change?a. hcl (aq) + naoh (aq) → nacl (aq) + h2o (l)b. 2na (s) + 2h2o (l) → 2naoh (aq) + h2 (g)c. cao (s) + h2o (l) → ca (oh) 2 (s)d. 2hclo4 (aq) + caco3 (s) → ca (clo4) 2 (aq) + h2o (l) + co2 (g)e. so2 (g) + h2o (l) → h2so3 (aq) ?