| 221. | How many atoms of sulfur join together to form a structure like a sulfur ring? |
A. 4 | |
B. 6 | |
C. 8 | |
D. 5 |
| 222. | The enemy element of copper is |
A. sulfur | |
B. Carbon | |
C. hydrogen | |
D. nitrogen |
| 223. | The process of heating rubber with sulfur is called? |
A. galvanization | |
B. sulfonation | |
C. vulcanization | |
D. Bessemerization |
| 224. | The element used to vulcanize rubber is? |
A. sulfur | |
B. bromine | |
C. silicone | |
D. phosphorus |
| 225. | Which of the following is added to natural rubber to make it more strong and elastic? |
A. sulfur | |
B. chlorine | |
C. Florin | |
D. bromine |
| 226. | What will be obtained if boiling sulfur is poured into cold water? |
A. prismatic sulfur | |
B. milky smell | |
C. monocular sulfur | |
D. plastic sulfur |
| 227. | Which gas is it that burns itself but does not help in burning, and smells like rotten eggs? |
A. nitrogen | |
B. oxygen | |
C. Carbon dioxide | |
D. hydrogen sulfide |
| 228. | Due to the presence of which of the following the color of brass gets discolored in air? |
A. oxygen | |
B. hydrogen sulfide | |
C. Carbon dioxide | |
D. nitrogen |
| 229. | On passing hydrogen sulphide gas in an acidic solution of potassium dichromate, the color of the solution becomes – |
A. pink | |
B. green | |
C. Blue | |
D. orange |
| 230. | Which of the following is responsible for acid rain? |
A. Carbon dioxide | |
B. carbon monoxide | |
C. propane | |
D. nitrous oxide and sulfur dioxide |