Question

In calcium hydride (CaH₂), the oxidation number of hydrogen is ………….

(A) +1 

(B) -1 

(C) +2 

(D) -2

Answer 1

Correct option is: (B) -1

Let say oxidation number of Hydrogen is x 

then, 1 x (+2) + 2 x (x) = 0

2x = -2

 = -1

Answer 2

Correct option is: (B) -1