redox reaction

Oxidation involves

• Loss of electrons

• Gain of electrons

• Increase in the valency of negative part

• Decrease in the valency of positive part

Which halide is not oxidised by MnO₂

• F

• Cl

• Br

• I

Of the four oxyacids of chlorine the strongest oxidising agent in dilute aqueous solution is

• HClO₄

• HClO

• HClO₃

• HClO₂

Strongest reducing agent is

• F^-

• Cl^-

• Br^-

• I^-

The valency of Cr in the complex [Cr(H₂O)₄Cl₂]⁺

• 1

• 3

• 4

• 6

In which of the following compound transition metal has zero oxidation state

• CrO₅

• NH₂NH₂

• [Fe(CO)₅]

• NOClO₄

Phosphorus has the oxidation state of +3 in

• Orthophosphoric acid

• Phosphorus acid

• Metaphosphoric acid

• Pyrophosphoric acid

Oxidation numbers of two Cl atoms in bleaching powder, CaOCl₂ are

• – 1, – 1

• + 1, – 1

• + 1, + 1

• 0, – 1

A compound is in its low oxidation state. Then its will be

• Highly acidic

• Highly basic

• Highest oxidising property

• Half acidic, half basic

Nitrogen show different oxidation states in the range

• 0 to +5

• – 3 to + 5

• – 5 to + 3

• – 3 to + 3