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  4. The metal which displaces hydrogen from a boiling caustic soda solution is:

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Q. The metal which displaces hydrogen from a boiling caustic soda solution is:

Hydrogen

Solution:

$Zn + NaOH \rightarrow \underset{\overset{\text{Sodium}}{\text{zincate}}}{Na_2ZnO_2} + H_2\uparrow$