Question

Hydrogen combines directly with

• A. Au
• B. Ni
• C. Ca
• D. Cu

Answer 1

The correct option is C

Ca

The explanation for the correct answer

• Hydrogen can easily combine with calcium to form the corresponding hydride. This is because of the high reactivity of the calcium.
• Calcium is the third most reactive metal and it is more reactive than Cu, Zn, and Fe.
• ${\mathrm{H}}_2$​ does not react with Au, Cu, or Ni. With Ca it gives ${\mathrm{CaH}}_2$
  $\mathrm{Ca}+{\mathrm{H}}_2\to {\mathrm{CaH}}_2$

Therefore the correct option is (c) Calcium.