Jamb Chemistry Past Questions For Year 2015
Question 1
A small quantity of solid ammonium chloride (NH4Cl) heated gently in a test tube, the solid gradually disappear produce two gases. Later, a white cloudy deposit was absence on the cooler part of the test tube. The ammonium chloride is to have undergo
- A. distillation
- B. sublimation
- C. precipitation
- D. evaporation
Question 2
The acid in electrolysis of water is dilute
- A. HNO3
- B. CH3COOH
- C. H2SO4
- D. HCl
Question 3
Vulcanization involve the removal of
- A. monometer
- B. the single bond
- C. the double bond
- D. a polymer
Question 4
The gas that is most useful in protecting humans against solar marathon is
- A. chlorine
- B. ozone
- C. carbon IV oxide
- D. hydrogen sulphide
Question 5
Cathode rays cause 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
