Jamb 2014 Chemistry Past Questions And Answers
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
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
How many protons, neutrons and electrons respectively are present in the element 60/27 Co?
- A) 27, 33 and 33
- B) 33, 27 and 27
- C) 27, 33, and 27
- D) 60, 33 and 60
The alkanol obtained from the production of soap is
- A) propanol
- B) ethanol
- C) glycerol
- D) methanol
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) none of the above
The petroleum fraction that is used in heating furnaces in industries is
- A) diesel oil
- B) gasoline
- C) kerosene
- D) lubricating oi
Beryllium and aluminium have similar properties because they
- A) are both metals
- B) belong to the same group
- C) belong to the same period
- D) are positioned diagonally to each other
The major and most effective way of controlling pollution is to
- A) improve machinery so that the substances released from combustion are less harmful
- B) pass strict laws against it by individuals and companies
- C) educate people on the causes and effects of pollution
- D) convert chemical wastes to harmless substances before releasing them into the environment
A compound that gives a brick-red colour to a non-luminous flame is likely to contain
- A) copper ions
- B) sodium ions
- C) calcium ions
- D) aluminium ions
The dispersion of a liquid in a liquid medium will give
- A) an emulsion
- B) a fog
- C) a gel
- D) an aerosol