Question

Which element among the following will not have an oxidation number of -1?

• A. $F$ in $HF$
• B. $Cl$ in $NaCl$
• C. $O$ in $H_2{O}_2$
• D. $F$ in $NaF$
• E. $H$ in $N{a}_{2}HP{O}_4$

Answer 1

The correct option is E $H$ in $N{a}_{2}HP{O}_4$

A) let x is oxidation number of $F$

1+x=0 (sum of all charges should be zero)

or x= -1

B) let x is oxidation number of $Cl$

1+x=0

or x= -1

C) let x is oxidation number of $O$

2*1+2*X=0

or x= -1

D) let x is oxidation number of $F$

1+X=0

or x= -1

E) let x is oxidation number of $H$

2*1+x+(-3)$=$0

or x$=$ +1