Question

In which compound does H show O. N of -1?

• A. ${Si \; H_4}$
• B. ${A_8 \; H_3}$
• C. ${N_3 H}$
• D. ${CaH_2}$

Answer 1

Answer: (D)

${CaH_2}$

Answer 2

Oxidation number of $CaH_2$:
$2+ 2x = 0$
$2x = -2$
$x=\frac{-2}{2}$
$=-1$