Chemistry 2005 Jamb Past Questions and Answers

Question 16 :

• JAMB 2005

How many hydrogen atoms does a single ring cycloalkane have less than the corresponding open-chain alkane?

A. Two
B. Three
C. Four
D. One

Question 17 :

• JAMB 2005

Equal moles of ethyne and hydrogen iodide react to give

A. CH₂ = CH₂
B. CH₂ - CHI
C. CH₃ - CI
D. CH₂ = CHI

Question 18 :

• JAMB 2005

A substance that is used as a ripening agent for fruits is

A. Ethene
B. Propene
C. Methane
D. Butane

Question 19 :

• JAMB 2005

When water boilers are used for long period of time, the solid substances left behind as scale are

A. Magnesium trioxosilicate (IV) and rust
B. Magnesium trioxosilicate (IV) and calcium tetraoxosulphate (VI)
C. Clay and magnesium troxosulphate (IV)
D. Clay and rust

Question 20 :

• JAMB 2005

25cm³ of a mixture of nobel gases was obtained from air after the removal of other constituents. What was the original volume of air

A. 2,500 cm³
B. 1250 cm³
C. 125 cm³
D. 80 cm³