what is the sum of the oxidation numbers of hydrogen in sodium hydride and in hydrogen chloride
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-1+1= 0
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Explanation:
In sodium hydride(NaH), Na has +1 charge and H is anion, since for a neutral molecule i.e. a compound, the total oxidation state is zero, so if we take ox no. of H in NaH as x, 1+x=0, ~x= -1. Similarly in HCL, H is a cation and Cl has oxidation no. -1, as HCl is a compound, its total oxidation state will be zero. Let us take ox no. of H in HCl as y, y+(-1)=0, ~y=1. So, sum of ox no. = x+y =1+(-1)=0
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