What is the oxidation number of molybdenum, Mo, in (MoO3 )-2   Question 1 options:   a. +6   b. +4   c. - 4   d.-2

What is the oxidation number of sulphur in the molecule S8? Select one: A. +4 B. +2 C. -2 D. 0

BR - 3 Given the following reaction:                Fe2+ + Cr2O72-→ Fe3+ + Cr3+   Balance the reaction. The coefficient for water in the balanced reaction is:   a. none of these b. 3 c. 7 d. 5 e. 1

For the reaction H2(g) + Br2(g) =2 HBr(g), Kc = 81.4 at 385°C. If [H2] = [Br2] = [HBr] = 2.4 x 10-4 M at 385°C, which one of the following is correct? %3D [HBr] increases as the system approaches equilibrium. [H2] and [HBr] decreases as the system moves toward equilibrium. [H2] and [Br2] increases as the system approaches equilibrium. There is not enough information given to make a determination. [HBr] and [Br2] increases as the system approaches equilibrium. The system is at equilibrium.