Question
Easy
Sunita drops a piece of potassium metal in a beaker of cold water and notes down the observations. Which of the following observation is not correct ?
1
Potassium reacts violently with water.
2
It is endothermic reaction
3
Hydrogen gas is evolved
4
Pop sound is heard.
Question Details
Time to Solve: 12
Exam: CTET
Level/Paper: CTET_P2
Chapter: Pedagogy of Science
Topic: Approaches & Evaluation in Science Teaching
Correct Answer
Option B
Explanation
Option 2 is the correct answer because the reaction between potassium metal and water is not an endothermic reaction; it is actually an exothermic reaction. In an exothermic reaction, heat is released, which is consistent with the behavior of potassium when it reacts with water. The reaction is highly exothermic, releasing enough heat to ignite the hydrogen gas that is produced, often resulting in a flame. Let's examine why theтАжRead More
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