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Test: Redox Reactions


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

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Test: Redox Reactions - Question 1

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

Detailed Solution for Test: Redox Reactions - Question 1

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

Test: Redox Reactions - Question 2

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

Detailed Solution for Test: Redox Reactions - Question 2

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.

Test: Redox Reactions - Question 3

Which substance is reduced in the following reaction?

ZnO + C → Zn + CO

Detailed Solution for Test: Redox Reactions - Question 3

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.

Test: Redox Reactions - Question 4

Rancidity can be prevented by:

Detailed Solution for Test: Redox Reactions - Question 4

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.

Test: Redox Reactions - Question 5

Chemically rust is:

Detailed Solution for Test: Redox Reactions - Question 5

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

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