31. The chlorinated alkane often used industrially to remove grease is?
- A. Tetrachloromethane
- B. Chloromethane
- C. Trichloromethane
- D. Dichloromethane
Reveal Answer
32. What mass of water is produced when 8.0g of hydrogen reacts with excess oxygen?
- A. 8.0g
- B. 16.0g
- C. 36.0g
- D. 72.0g
Reveal Answer
33. Proteins in acid solution undergo?
- A. Substitution
- B. Fermentation
- C. Hydrolysis
- D. Polymerisation
Reveal Answer
34. The general formula for the Alkanals is?
- A. R2CO
- B. RCHO
- C. ROH
- D. RCOOR
Reveal Answer
35. When cathode rays are deflected onto the electrode of an electrometer, the instrument becomes?
- A. Bipolar
- B. Negatively charged
- C. Positively charged
- D. Neutral
Reveal Answer
36. When a solid substance disappears completely as a gas on heating, the substance is said to have undergone?
- A. Sublimation
- B. Crystallization
- C. Distillation
- D. Evaporation
Reveal Answer
37. An electron can be added to a halogen atom to form a halide ion with?
- A. 8 valence electrons
- B. 7 valence electrons
- C. 2 valence electrons
- D. 3 valence electrons
Reveal Answer
38. Aluminum hydroxide is used in the dyeing industry as a?
- A. Dye
- B. Dispersant
- C. Salt
- D. Mordant
Reveal Answer
39. The most important element on the earth’s crust is?
- A. Nitrogen
- B. Hydrogen
- C. Oxygen
- D. Fluorine
Reveal Answer
40. To obtain pure carbon(ii)oxide from its mixture with carbon(iv)oxide, the mixture should be?
- A. Passed over heated copper(ii)oxide
- B. Bubbled through water
- C. Bubbled through conc H2SO4
- D. Bubbled through conc NAOH
Reveal Answer
