Discussion
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 ?
Answer: B
The incorrect observation is that it is an endothermic reaction.
Potassium reacts violently with cold water, forming potassium hydroxide and hydrogen:
\[ 2K + 2H_2O \rightarrow 2KOH + H_2 \]
The reaction is strongly exothermic: so much heat is released that the hydrogen catches fire with a pop. So the reaction being violent, hydrogen being evolved and a pop sound being heard are all correct observations.
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