| 251. | Marshallic acid is also known as – |
A. H₂SO₅ | |
B. H₂S₂O₇ | |
C. H₂S₂O₈ | |
D. H₂SO₄ |
| 252. | Which halogen element combines with xenon to form the maximum number of compounds? |
A. florin | |
B. chlorine | |
C. bromine | |
D. iodine |
| 253. | The halogen found by Teplon is – |
A. chlorine | |
B. florin | |
C. bromine | |
D. iodine |
| 254. | Which of the following is not a member of the halogen family? |
A. florin | |
B. chlorine | |
C. morphine | |
D. bromine |
| 255. | The most reactive among halogens is – |
A. florin | |
B. chlorine | |
C. bromine | |
D. iodine |
| 256. | Halogen element is – |
A. Na and K | |
B. F, Cl, Br, I and At | |
C. Mg and Ca | |
D. He and Ne |
| 257. | The atomic number of chlorine is – |
A. 7 | |
B. 9 | |
C. 11 | |
D. 17 |
| 258. | Which of the following gas is used as tear gas? |
A. hydrogen | |
B. sulfur dioxide | |
C. nitrogen | |
D. chlorine |
| 259. | Which of the following gas is colourful? |
A. oxygen | |
B. chlorine | |
C. hydrogen | |
D. nitrogen |
| 260. | What is the most commonly used bleaching reagent? |
A. alcohol | |
B. chlorine | |
C. Sodium chloride | |
D. carbon dioxide |