From the following compounds H_(2)S,PH_(3),CaH_(2),BeH_(2) which pair is having oxidation number same as hydrogen ?

From the following compounds H_(2)S,PH_(3),CaH_(2),BeH_(2) which pair

1.	From the following compounds H_(2)S,PH_(3),CaH_(2),BeH_(2) which pair is having oxidation number same as hydrogen ?
Answer» `H_(2)S,CaH_(2)` `PH_(3),BeH_(2)` `H_(2)S,PH_(3)` `H_(2)S,BeH_(2)` Solution :`CaH_(2)andBeH_(2)` are hydride compounds so oxidation number of H is -1 while oxidation number of H in `H_(2)SandPH_(3)` is +1. THEREFORE the oxidation number of H of GIVEN pair in option (A) is (+1,-1), in option (B) it is (+1,-1), in option ( C) it is (+1, +1) and in option (D) it is (+1,-1). So it is clear that the pair given in option ( C) having oxidation number same as HYDROGEN.