1/ K + H2O ------> KOH +............. 2/ P +.......... -----> P2O3 3/ AL + HCL --------> ALCL3 + ................ 4/ AL + O2 ---------> ....................... 5/ Zn + ............. -------> ZnCb + H2

`1/` `2K``+``2H_2O``→``2KOH``+``H_2`

`2/` `4P``+``5O_2`$\xrightarrow[]{t^o}$`2P_2``O_5`

`3/` `2Al``+``6HCl``→``2AlCl_3``+``3H_2`

`4/` `4Al``+``3O_2`$\xrightarrow[]{t^o}$`2Al_2``O_3`

`5/` `Zn``+``2HCl``→``ZnCl_2``+``H_2`

1/ K + H2O ------> KOH +.....$H_{2}$ ........

2/ 4P +....3$O_{2}$ .... -----> 2P2O3

3/ 2AL + 6HCL --------> 2ALCL3 + ........3$H_{2}$........

4/ 4AL + 3O2 ---------> ...........2$Al_{2}$$O_{3}$ ............

5/ Zn + .......2HCl...... -------> ZnCl2 + H2

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