Jamb Chemistry Past Questions For Year 2009
Question 16
Water can be obtained as the only product during the?
- A. combustion of hydrocarbons
- B. neutraliization of an acid by base
- C. combustion of hydrogen
- D. electrolysis of brine
Question 17
When sodium trioxocarbonate (IV) decahydrate loses its water of crystallization to the atmosphere, the process is?
- A. deliquescence
- B. efflorescence
- C. hygroscopic
- D. effervesecence
Question 18
The oxidation state of Cr in K\(_2\)Cr\(_2\)O\(_7\) is?
- A. +7
- B. +6
- C. +5
- D. 4
Question 19
The colour changes observed when testing for reducing agents using acidified potassium heptaoxodichromate (VI) solution is?
- A. yellow to purple
- B. orange to green
- C. green to orange
- D. purple to yellow
Question 20
The salt formed from a reaction between citric acid and sodium hydroxide in solution will be?
- A. acidic
- B. basic
- C. complex
- D. neutral
