Test: Redox Reactions

5 Questions MCQ Test Science Class 10 | Test: Redox Reactions

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In which of the following compounds, nitrogen exhibits highest oxidation state?


The correct option is Option C.

(i) N3

O.S => 3x + 1 = 0

x = -⅓

(ii) NH

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, which of following is/are oxidizing agents? 
a. Oxygen
b. Hydrogen peroxide
c. Gains oxygen


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.


Which substance is reduced in the following reaction?

ZnO + C → Zn + CO


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.


Rancidity can be prevented by:


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:


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

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