Water - Jamb Chemistry Past Questions and Answers

Question 51:

• JAMB 2002

Tetraoxosulphate (VI) acid burns the skin by

A. Hydrolysis
B. Hydration
C. Heating
D. Dehydration

Question 52:

• JAMB 2002

When a salt loses its water of crystallization to the atmosphere on exposure, the process is said to be

A. Efflorescence
B. Deliquescence
C. Effervescence
D. Fluorescence

Question 53:

• JAMB 2004

Hardness of water is caused by the presence of ions of

A. Magnesium and silver
B. Cacium and magnesium
C. Sodium and potassium
D. Calcium and sodium

Question 54:

• JAMB 2004

When steam is passed over red-hot carbon, the substances produced are

A. Hydrogen and trioxocarbonate (IV) acid
B. Hydrogen, oxygen and carbon (IV) oxide
C. Hydrogen and carbon (II) oxide
D. Hydrogen and carbon (IV) oxide

Question 55:

• 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