Jamb Chemistry Past Questions For Year 2009
Question 11
Cathode rays causes an object placed behind a perforated anode to cast a shadow on the screen. This observation shows that the rays?
- A. are positively charged
- B. are negatively charged
- C. have mass
- D. travel in straight lines
Question 12
If an atom is represented as \( _{11}^{23}X \), which of the following deduction is correct?
- A. it contains 12 protons
- B. it forms a covalent chloride
- C. its atomic number is 23
- D. it is an alkali metal
Question 13
The major source of oxides of nitrogen is from the burning of
- A. coal
- B. wood
- C. fuel
- D. chlrofluorocarbons
Question 14
For a given solute, the concentration of its saturated solution in different solvents are
- A. the same at the same temperature
- B. different at the same temperature
- C. the same at different temperature
- D. constant
Question 15
If 10.5g of lead (II) trioxonitrate (V) is dissolved in 20cm3 of distilled water at 18oC, the solubility of the solute in mol dm-3 is
[Pb = 207, N = 14, O = 16]
- A. 1.60
- B. 5.25
- C. 16.00
- D. 525.00
