| 201. | Which refrigerant is generally used in domestic refrigerator? |
A. Neon | |
B. ammonia | |
C. nitrogen | |
D. Freon |
| 202. | Tear gas is |
A. ammonia | |
B. chlorine | |
C. hydrogen carbide | |
D. hydrogen sulfide |
| 203. | The smoke emanating from ammonium chloride powder used for cleaning hot utensils while tinning brass utensils is – |
A. of ammonia | |
B. carbon monoxide | |
C. hydrochloric acid | |
D. ammonia and hydrochloric acid |
| 204. | An unknown gas readily dissolves in water. This gas turns red litmus blue and gives white smoke with hydrogen chloride, this gas is – |
A. sulphur dioxide | |
B. nitrous oxide | |
C. ammonia | |
D. carbon monoxide |
| 205. | The suitable conditions for the manufacture of ammonia by Haber’s process are – |
A. high pressure and low temperature | |
B. high pressure and high temperature | |
C. low pressure and low temperature | |
D. low pressure and high temperature |
| 206. | Aquaregia is a mixture of which of the following in the ratio 1:3 by volume? |
A. concentrated HNO₃ and concentrated HCI | |
B. concentrated HNO₃ and concentrated H₂SO₄ | |
C. dilute HCI and dilute HNO₃ | |
D. concentrated HCI and concentrated HNO₃ |
| 207. | In which acid does gold dissolve? |
A. in nitric acid | |
B. in hydrochloric acid | |
C. in sulfuric acid | |
D. and Amalraj |
| 208. | Aquaregia concentrate is prepared by mixing HNO₃? |
A. concentrated H₂SO₄ | |
B. concentrated H₃PO₄ | |
C. concentrated HCI | |
D. concentrated HBr |
| 209. | The molecular formula of phosphorus is – |
A. P₁ | |
B. P₂ | |
C. P₃ | |
D. P₄ |
| 210. | The most stable form of phosphorus is |
A. yellow phosphorus | |
B. red phosphorus | |
C. purple phosphorus | |
D. black phosphorus |