Question

Oxidation number of S in Na₂S₄O₆ is

(a) 1.5

(b) 2.5

(c) 3

(d) 2

Answer 1

Correct option is (b) 2.5

Na₂S₄O₆

\(2 \times 1 + 4\times x + 6 \times (-2) = 0\)

\(2 + 4x -12 = 0\)

\(4x = 10\)

\(x = 2.5\)