Jamb Chemistry Past Questions For Year 1998
Question 16
On cracking medicinal paraffin, a gas is evolved which gives a pop sound with a lighted splinter and an oily liquid which decolourizes bromine solution is also obtained. The products of the cracking are ?
- A. carbon (IV) oxide and alkyne
- B. carbon (ll) oxide and alkene
- C. hydrogen gas and alkene
- D. hydrogen gas and alkane
Question 17
One mole of hydrocarbon contains 6g of hydrogen. If the molecular weight is 54, the hydrocarbon is an?
- A. alkanone
- B. alkane
- C. alkene
- D. alkyne
Question 18
Alloys are often used in preference to pure metals because?
- A. metals are too hard
- B. merals are ductile
- C. metallic properties are improve in alloys
- D. alloys are a mixture of metals
Question 19
A common characteristic shared by iron and aluminium is that both?
- A. are extracted by reduction methods
- B. form only basic oxides
- C. show oxidation states of +2 and +3
- D. form soluble hydroxides
Question 20
Which of the following is true concerning the properties of benzene and hexane?
- A. Both undergo substitution reaction
- B. Both undergo addition reaction
- C. Both are solids
- D. Both can decolourized bromine water
