В каких реакциях образуется H2?
1. Na+H2O---NaOH+........
2. Fe+H2O---Fe3O4+.......
3. Cu+HNO3---Cu(NO3)2+.....
4. KOH+HCL---KCL+.....
1. Na+H2O---NaOH+........
2. Fe+H2O---Fe3O4+.......
3. Cu+HNO3---Cu(NO3)2+.....
4. KOH+HCL---KCL+.....
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Ответ:
1)2)
Объяснение:
2Na + 2H2O = 2NaOH + H2↑
2Fe + 3H2O = Fe2O3 + 3H2↑
Cu + 4HNO3 = Cu(NO3)2 + 2NO2↑ + 2H2O
KOH + HCl = KCl + H2O