| 211. | Which acid is used in the manufacture of photography |
A. formic acid | |
B. oxalic acid | |
C. citric acid | |
D. acetic acid |
| 212. | How is oxalic acid used in photography? |
A. sodium oxalate | |
B. ferrous oxalate | |
C. diethyl oxalate | |
D. calcium oxalate |
| 213. | used to remove ink stains |
A. benzoic acid | |
B. acetic acid | |
C. oxalic acid | |
D. boric acid |
| 214. | Used to remove rust stains from clothes |
A. kerosene | |
B. chose | |
C. petrol | |
D. oxalic acid |
| 215. | Stones formed in human kidney are usually made up of |
A. from calcium oxalate | |
B. from sodium acetate | |
C. from magnesium sulfate | |
D. from calcium |
| 216. | Doctors are of the opinion that people suffering from kidney and gall bladder stones should not take tomatoes, eggs, milk and cabbage in large quantities so that crystals of the following are not formed? |
A. calcium phosphate | |
B. calcium oxalate | |
C. calcium chloride | |
D. calcium sulfate |
| 217. | Which of the following carbon compounds is used to remove iron stains from iron compounds? |
A. oxalic acid | |
B. benzoic acid | |
C. phthalic acid | |
D. cinnamic acid |
| 218. | In what form is oxalic acid present in plant cells? |
A. sodium oxalate | |
B. calcium oxalate | |
C. zinc oxalate | |
D. potassium oxalate |
| 219. | What is iodoform used for? |
A. antipyretic | |
B. pain reliever | |
C. counter supply | |
D. anesthesia |
| 220. | Which organic compound was first prepared in the laboratory |
A. methane | |
B. Ethylene | |
C. ethane | |
D. urea |