1. Which of the following is a non metal that remains liquid at room temperature ?
2. The gas usually filled in the electric bulb is :
(c) carbon dioxide
3. Washing soda is the common name for :
(a) Sodium carbonate
(b) Calcium bicarbonate
(c) Sodium bicarbonate
(d) Calcium carbonate
4. Which of the gas is not known as green house gas ?
(b) Nitrous oxide
(c) Carbon dioxide
5. Which of the following is used as a lubricant ?
(c) Iron Oxide