Which of the following elements never show positive oxidation number?
O
Fe
Ga
F
D.
F
Fluorine is the most electronegative element in the periodic table so it never shows positive oxidation state.
KI and CusO4 solution when mixed, give :
CuI2 + K2SO4
Cu2I2 + K2SO4
K2SO4 + Cu2I2 + I2
K2SO4 + CuI2 + I2