Test: Redox Reactions - Class 10 MCQ

The correct option is Option C.

(i) N₃H 

O.S => 3x + 1 = 0

x = -⅓

(ii) NH₃ 

O.S => x + 3 = 0

x = -3

(iii) NH₂ — OH

O.S => x + 2 - 1 = 0

x = -1

(iv) N₂H₄ 

O.S => 2x + 4 = 0 

X = - 4/2 = -2

Therefore, highest oxidation state of nitrogen is -⅓

An oxidizing agent (oxidant, oxidizer) is a substance that has the ability to oxidize other substances — in other words to cause them to lose electrons. Common oxidizing agents are oxygen, hydrogen peroxide and the halogens.

ZnO + C → Zn + CO

The above reaction is already balanced.
In this reaction, zinc oxide is reduced to zinc by reducing agent agent coke and carbon is oxidised to carbon monoxide.

It can be prevented by following methods:

(i) The packing of food materials should be replaced the air with Nitrogen.

(ii) The food materials should be placed at very low temperatures.

(iii) Addition of antioxidants also prevents rancidity process.

Chemically, rust is hydrated ferric oxide (Fe₂O₃.nH₂O) as n molecules of water are attached.