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All questions of Reactivity for Class 9 Exam
Which of the following is an example of an endothermic reaction?- a)Mixing sodium hydroxide with hydrochloric acid
- b)Iron rusting in the presence of oxygen
- c)Sodium hydrogencarbonate reacting with citric acid
- d)Burning magnesium in air
Correct answer is option 'C'. Can you explain this answer?
Which of the following is an example of an endothermic reaction?
a)
Mixing sodium hydroxide with hydrochloric acid
b)
Iron rusting in the presence of oxygen
c)
Sodium hydrogencarbonate reacting with citric acid
d)
Burning magnesium in air
 | Imk Pathshala answered |
The reaction between sodium hydrogencarbonate and citric acid is an endothermic reaction because it absorbs energy from the surroundings, resulting in a cooling effect. This absorption of energy is why the reaction is often used in making sherbet sweets, creating a refreshing sensation when consumed. In contrast, burning magnesium and mixing strong acids with bases typically releases energy.
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