Jamb Chemistry 2014 Past Questions and Answers

Question 11:

• JAMB 2014

A silicon -containing ore has 92% ²⁸Si, 5% ²⁹Si and 3% ³⁰Si. Calculate the relative atomic mass of the silicon.

A. 14.00
B. 29.00
C. 28.11
D. 28.00

Question 12:

• JAMB 2014

The nitrogen obtained from air has a density higher than the one from nitrogen-containing compounds because the one from air is contaminated with

A. Water vapour
B. Oxgyen
C. Rare gases
D. Carbon (IV) oxide

Question 13:

• JAMB 2014

Water is said to be temporarily hard when it contains

A. Ca (HCO₃)₂ and Mg (HCO₃)₂ salts
B. Ca (HCO₃)₂ and CaCO₃ SALTS
C. Mg(HCO₃)₂ and CaSO₄ salts
D. CaSO₄ and Ca(HCO₃)₂ salts

Question 14:

• JAMB 2014

On exposure to the atmosphere, a hydrated salt loses its water of crystallization to become anhydrous. This phenomenon is referred to as

A. Efflorescence
B. Diliquescence
C. Hygroscopy
D. Hydrolysis

Question 15:

• JAMB 2014

16.55g of lead (ll) trioxonitrate (V) was dissolved in 100g of distilled water at 20oC, calculate the solubility of the solute in moldm-3
[Pb = 207, N = 14, O = 16]

A. 0.05 g
B. 2.00 g
C. 1.00 g
D. 0.50g