Jamb Chemistry Past Questions For Year 1981
Question 6
The oxidation number of manganese in KMnO4 is?
- A. +1
- B. +3
- C. +5
- D. +7
- E. +2
Question 7
An example of a strong electrolyte is?
- A. ethyl acetate
- B. ethanol
- C. glucose
- D. sodium formate
- E. formic acid
Question 8
When glowing splint is inserted into the mouth of a jar containing a gas, the splint is extinguished. The gas gives a white precipitate when passing into barium hydroxide. The gas is?
- A. methane
- B. hydrogen chloride
- C. hydrogen
- D. nitrogen
- E. carbondioxide
Question 9
Which of the following statements is NOT true of electrovalent compounds?
- A. They are solids
- B. They do not vaporized easily
- C. They usually dissolve in water
- D. The elements forming the compounds normally have their valency electrons in a shared state
- E. They conduct electricity
Question 10
the number of atoms in one mole of a substance is equal to?
- A. the atomic number
- B. the avogadro number
- C. the gas constant
- D. the number of neutrons
- E. the number of electrons
