Water - Chemistry Jamb Past Questions and Answers

Question 6 :

• JAMB 1980

The boiling point of water is higher than that of methanol because?

A. Water is oxide while methanol is an alcohol
B. Inter molecular forces in water are stronger than those in methanol
C. Water is an inorganic compound while methanol is organic
D. Water is an ionic compound while methanol is a covalent compound
E. Water is more reactive than methanol

Question 7 :

• JAMB 1981

In the reaction of oxygen with hydrogen to produce water, which of the following statements is true?

A. One atom of hydrogen reacts with two atoms of oxygen to give one molecule of water
B. Two atoms of hydrogen react with two atoms of oxygen to give two molecules of water
C. One molecule of oxygen reacts with one molecule of hydrogen to give two molecules of water
D. One molecule of hydrogen reaccts with two molecules of oxygen to give three molecules of water
E. One molecule of oxygen reacts with two molecules of hydrogen to give two molecules of water

Question 8 :

• JAMB 1981

An efflorescent compound is a substance that?

A. Absorbs water froom the air without dissolving in it
B. Is capable of giving off coloured luminosity
C. Gives out water to the atmosphere
D. Absorbs water from the air and dissolves in it
E. Gives out its water of crystallization on heating

Question 9 :

• JAMB 1983

Sodium sulphate decahydrate (Na₂SO₄.10 H₂O) on exposure to air loses all its water of crystallization.
The process of loss is known as

A. Efflorescence
B. Hygroscopy
C. Deliquescence
D. Effervescence
E. Dehydration

Question 10 :

• JAMB 1983

Crude petroleum pollutant usually seen on some Nigerian creeks and waterways can be dispersed or removed by

A. Heating the affected parts in order to boil off the petroleum
B. Mechanically stirring to dissolve the petroleum in water
C. Pouring organic solvents to dissolve the petroleum
D. Spraying the water with stergents
E. Cooling to freeze out the petroleum