how do some metals react with bases
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Amphoteric metals react with bases. When alkali (base) reacts with metal, it produces salt and hydrogen gas.
Alkali + Metal ⇨ Salt + Hydrogen
Example: Sodium hydroxide gives hydrogen gas and sodium zincate when reacts with zinc metal.
2NaOH + Zn ⇨ Na2ZnO2+ H2
Sodium aluminate and hydrogen gas are formed when sodium hydroxide reacts with aluminium metal.
2NaOH + 2Al + 2H2O ⇨ 2NaAlO2+ 2H2
Alkali + Metal ⇨ Salt + Hydrogen
Example: Sodium hydroxide gives hydrogen gas and sodium zincate when reacts with zinc metal.
2NaOH + Zn ⇨ Na2ZnO2+ H2
Sodium aluminate and hydrogen gas are formed when sodium hydroxide reacts with aluminium metal.
2NaOH + 2Al + 2H2O ⇨ 2NaAlO2+ 2H2
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Metal reacts with bases to fOrm salt and hydrogen
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