Q2 of 44 Page 1

The following reaction is an example of a

4NH3 (g) +5O2 (g) → 4NO (g) +6H2O (g)


1. displacement reaction


2. combination reaction


3. redox reaction


4. neutralisation reaction

This is a redox reaction because oxidation and reduction both are happening simultaneously. It is also a displacement reaction because H of NH3 is displaced by oxygen. A displacement reaction is also a redox reaction as it is always followed by oxidation as well as reduction.


Note: When oxygen is added to a compound in a reaction, it is called oxidation. Removal of oxygen from a substance during a reaction is called reduction. Here, NH3 is changing to NO. So, NH3 is undergoing oxidation. Addition of hydrogen atom is also reduction. Here, oxygen is getting reduced.

More from this chapter

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1

Which of the following is not a physical change?

 3

Which of the following statements about the given reaction is correct?

3Fe(s) + 4H2O→ Fe3O4 + 4H2


a. Iron metal is getting oxidised.


b. Water is getting reduced.


c. Water is acting as reducing agent.


d. Water is acting as oxidising agent.

 4

Which of the following are exothermic processes?

1. Reaction of water with quick time


2. Dilution of an acid


3. Evaporation of water


4. Sublimation of camphor (crystals)

 5

Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of Na0H, anhydrous CuSO2 and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the solution falls. Which one of the following statement (s) is (are) correct?

1. In beakers A and B, exothermic process has occurred.


2. In breakers A and B, endothermic process has occurred.


3. In breaker C, exothermic process has occurred.


4. In beaker C, endothermic process has occurred.