Q. Which of the following elements are liquid at or near room temperature?

1. Cesium
2. Mercury
3. Gallium
4. Francium

Select the correct option from the codes given below:
Answer: 1, 2, 3 & 4
Notes: Mercury is liquid at room temperature. Cesium, gallium, and francium also melt just above or near room temperature and can exist as liquids under standard conditions. All four elements—cesium, mercury, gallium, and francium—are known for this unique property among metals.