Answer: A, C
Of 6 Cl atoms, 5 go 0 to -1 (reduced) and 1 goes 0 to +5 (oxidised), so statement 1 is true. The electrons transferred are 5 (5 x 1 gained = 1 x 5 lost), not 10, so statement 2 is false. The equation shows 3 HX2O (statement 3 true). OHX− only provides the medium; ClX2 is both oxidised and reduced, so statement 4 is false.