Jamb 2008 Chemistry Past Questions And Answers
The oxidation state of carbon in HCOOH is
- A. -1
- B. +2
- C. +3
- D. zero
Air boiled out of water as steam is richer in
- A) nitrogen and oxygen
- B) carbon (IV) oxide and oxygen
- C) noble gases and carbon (IV) oxide
- D) oxygen and noble gases
In the course of purifying water for town supply the water is passed through large settlings tanks, containing sodium aluminate (III) to remove
- A) large particles
- B) germs
- C) fine particles
- D) odour
The uncovered raw food that is sold along major roads is likely to contain some amounts of
- A. Pb
- B. Cu
- C. Ag
- D. Na
Polyvinyl chloride is used in the production of
- A. glass
- B. alloy
- C. pipes
- D. ceramics
In the course of purifying water for town supply the water is passed through large settlings tanks, containing sodium aluminate (III) to remove
- A. large particles
- B. germs
- C. fine particles
- D. odour
Use the diagram to answer this question. The colour of the fountain water is
- A. blue
- B. orange
- C. red
- D. yellow
The vulcanizer's solution is prepared by dissolving rubber in
- A. ethanol
- B. kerosine
- C. benzene
- D. petrol
NH3(g) + HCl(s) → NH4Cl(s) The entropy change in the system above is
- A. positive
- B. zero
- C. negative
- D. indeterminate
2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g) From the equation above, calculate the mass of sodium hydroxide produced by 2.3g of sodium. [H = 1, O = 16, Na = 23]
- A. 0.40g
- B. 0.80g
- C. 4.00g
- D. 8.00g