Find the oxidation numbers! (f) to (i)

f)the oxidation numbers of H = +1
the oxidation numbers of Cl = -1
? + (+1)(4) + (-1) = 0
? + (+3) = 0
? = -3
∴the oxidation numbers of the highlighted and bold elements is -3.

g)the oxidation numbers of H = +1
the oxidation numbers of O = -2
(+1) + ? + (-2)(3) = -1
? + (-5) = -1
? = +4
∴the oxidation numbers of the highlighted and bold elements is +4.

h)the oxidation numbers of O = -2
(?)(2) + (-2)(7) = -2
(?)(2) + (-14) = -2
(?)(2) = +12
? = +6
∴the oxidation numbers of the highlighted and bold elements is +6.

i)the oxidation numbers of the F = -1
? + (-1)(3) = 0
? = +3
∴the oxidation numbers of the highlighted and bold elements is +3.

f) -3

g) 4

h) 6

i) i dont know