Question

what is reaction of metal with base

Answer 1

Only some metals like aluminium and zinc dissolve in alkalis like sodium hydroxide and potassium hydroxide, forming salts and liberating hydrogen.
2Al + 2H2O + 2KOH → K2Al2O4 + 3H2
Zn + 2NaOH → Na2ZnO2 + H2


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Answer 2

When alkali (base) reacts with metal, it produces salt and hydrogen gas. Example: Sodium hydroxide gives hydrogen gas and sodium zincate when reacts with zinc metal. Sodium aluminate and hydrogen gas are formed when sodium hydroxide reacts with aluminium metal.