Q. Which of the following is the softest metal?
Answer: Cesium
Notes: Cesium is extremely reactive metal. It reacts with water even at −116 °C (−177 °F). It is the least electronegative element. Cesium is also the softest known metal. It is so soft that it can be cut with a butter knife.

This question is part of 40000+ General Studies MCQ Series Course on GKToday Android app. Question Number: 22 in Chemistry-17-Important Metals in above course in App.