Which of the following metal will not give H2 gas with NaOH.

  • Al
  • Zn
  • Sn
  • Ca

The correct answer will be Ca. Ca does not react with sodium hydroxide to produce hydrogen .
All other 3 will release H2 gas as follows:
2Al(s) + 2NaOH(aq) + 6H2O → 2Na+(aq) + 2[Al(OH)4]- + 3H2(g)

Sn + 2 NaOH + 4 H2O → Na2[Sn(OH)6] + 2 H2

  • 15

zinc (Zn)...because it is less reactive than sodium (Na)...thus it will not displace it from iits solution.

  • -4
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